Bucky Barnes, Cap's replacement, showed up out of nowhere in Fear Itself only to be manhandled by the new Red Skull. She slaps him around with his own severed bionic arm before being impaled by a magic hammer.
Turns out he was still alive. He was severely injured, but we find out that Bucky's death was faked to get Steve Rogers back in the Captain America costume and lead the others that way.
After the House of M event in the Marvel Comics universe, many mutants lost their powers. The ones who got it the worse were probably a set of young student X-Men, mostly minor characters in the series, who were literally Put on a Bus... then the bus was hit by a missile. Every one of them died.
Exiles member Sunfire was killed off by dropping a literal bridge on her. Or maybe it was a building. I can't remember because it happened off-panel.
Jean Grey's death in the 2003 'Planet X' storyline fits this to a "T". Her marriage to Scott had a bridge dropped on it in more ways than one at the same time.
Not even including how many 'show, don't tell' rules it broke, Janet "The Wasp" van Dyne's death at the end of the Secret Invasion likely counts. An alien agent impersonating her husband gives her a "stabilized" version of the serum to make herself grow as well as shrink, only for her to realize too late that it can also turn her into a giant biological bomb at his command. Despite her efforts to get out of the fight and minimize casualties, she ends up having to be teleported to another plane by a blow from Mjolnir, so that instead of taking out all of the Avengers' allies, she dies alone. And while her soul's trapped in Erebus gambling for either resurrection or an afterlife, her soulless body is now a dimension. Housing Ultron. Her husband ends up building a house on her.
On one hand, it turned out that wasn't really the Wasp's body in that dimension. On the other, it seems her real body has been reanimated as a cyborg zombie.
Maybe. The "reanimation" was left entirely ambiguous as to whether it was her or a clone/LMD/whatever designed to throw the Avengers off, and then the whole thing is completely forgotten in favor of the next Big Damn Event. For all we know, she's still nothing but scattered atoms somewhere. Jesus, Marvel, cut the woman a break already.
As of 2012 Wasp is found alive and sane in a miniature dimension. In which, most of the founding Avengers went to save her. They succeed and bring her back to their reality, and is currently part of the Uncanny Avengers
Furthermore in Ultimate Spider-Man, Gwen Stacey does what she does best- dies. But whereas her death in the classic continuity was a major series turning point and one of the most shocking and unexpected events in the history of comics, forever solidifying Norman Osborn as Peter's greatest nemesis, in the Ultimate universe she's jumped in Peter's backyard by mindless monster Carnage and sucked dry. That's it.
The suddenness and brutality of her Ultimate death still caused it to have a considerable impact on the series though and in any case she comes back. As Carnage!
Crisis Crossover series, especially at DC, are notorious for killing off characters who've been around a long time in awkward, Red Shirt like ways, just to show how bad the Big Bad is. These characters are lucky if they get more than one or two lines of dialogue. Some examples include the Losers, Dove of Hawk and Dove, and the original Mirror Master in Crisis on Infinite Earths, Justice Society members Atom (Al Pratt) and Dr. Mid-Nite in Zero Hour (Hourman also died, but he got better), and most of the Freedom Fighters (Phantom Lady, Human Bomb, Doll Man) in Infinite Crisis.
And in Final Crisis, Batman and Darkseid pull one on each other at the same time with a gun and eye beams respectively. Yes, a double bridge drop in a single scene. And while Darkseid is killed in that scene, Bats is now lost in time and cursed with multiple lives. It does take Darkseid most of the next issue to completely die, though. And Batman's since come back.
Teen Titans characters like Pantha and Wildebeest died just to give Superboy-Prime, who'd already had a Face-Heel Turn, a moment where he crosses the Moral Event Horizon. Neither of these characters are given many lines, or a chance for those not familiar with them already to get to know them, before they die.
In the ninth chapter of Crisis on Infinite Earths, Brainiac and the Silver-Age Luthor lead an army of villains. Golden-Age Luthor (who'd been around since at least the early 1940s) appears just long enough to say that he, not Silver-Age Luthor, should be their leader. Brainiac says "You are right. We do not need two Luthors.", and disintegrates Golden-Age Luthor. No final battles with Superman for that Luthor. Instead, he goes out like your usual faceless henchman.
Countdown to Final Crisis has several, though the most egregious examples of victims to this fate are Duela Dent, the Jokester, Trickster, and three entire Earths. Countdown is very mean spirited overall.
There's a good amount of this in Blackest Night, often to make room for their replacements/predecessors. Tempest gets his heart ripped out by Black Lantern Tula, making room for the Young Justice version of Aqualad, and the second Hawk is also killed to free up space for her predecessor to return. Dr. Polaris gets it bad too, dying off-screen. Captain Boomerang Jr. went from being an antihero who had movie nights with Supergirl to someone who helps his Obviously Evil zombie father kill and devour women and children. Firestorm's girlfriend Gehenna got her heart ripped out and turned to salt simultaneously.
After countless times of escaping death, after being one of the most evil and powerful of supervillains, after clashing with Superman and the Green Lantern Corps and allying himself with the some of the greatest evil powers of the DC universe (Mongul and the Anti-Monitor being a few), how does the normally unkillable Hank Henshaw finally die? He makes the mistake of transferring into a cybernetic character who already has a soul, and then is soul-killed by said character which Word of Godsays is permanent. What makes it worse is that he is killed by a supporting Green Lantern character who has only made less than a dozen appearances total, and while on the astral plane he was just an ordinary human; reflective of his soul. So his end was in a crubstomp fight of a trained warrior woman killing an elderly man.
Marvel's Ultimatum is infamous for this trope, as it kills off over half the cast of Marvel's Ultimate Universe in brutal, violent, pointless ways similiar to many of the above DC examples. The most infamous is the Blob's gruesome murder of the Wasp.
Due to Executive Meddling, this was the fate of all of the Dead Universe Transformers in Simon Furman's Transformers comics for IDW. Grindcore, Straxus, Cyclonus, Bludgeon, Thunderwing, and Monstructor were all destroyed (or presumed to be destroyed/deactivated) offscreen after the Autobots managed to deactivate the machines keeping them from disintegrating in the Live Universe. While this was probably going to be the case anyway, it felt like a Bridge Dropping because these characters had all of four issues to terrorize the Autobots, and it was left unclear whether the mind-controlled Decepticons died or were defeated offscreen.
Later stories revealed that Cyclonus, Bludgeon and Monstructor all survived, but confirmed the deaths of Grindcore and Straxus. Thunderwing's still up in the air.
A few years ago, Harbinger, one of the heroes of Crisis on Infinite Earths, was abruptly killed offscreen by Apocalpytican forces in the pages of Superman/Batman when she tried to prevent them from kidnapping Supergirl from Themiscyra, a role that could have easily been filled by any generic Amazon. Can't anybody from that story get a happy ending?
This happened to Ryan Choi, the second Atom in the pages of DC's Titans: Villains For Hire at the hands of Deathstroke to make Slade seem like more of a threat. The fact that this is the second Asian character to get killed by DC to make a villain seem more dangerous in as many months (the first being Lian Harper) has not gone over well with fans.
Especially since A) this was Deathstroke who's already been established as one of the most ruthless badasses in the DCU for over twenty years and B) the person who hired him turned out to be Dwarfstar, a character who was created specifically as Ryan's nemesis.
The reception was so poor that the entire series of events was retconned in The New 52 and now Ryan is back to being the sole Atom.
Terra 2 from Teen Titans gets pointlessly killed one day to make way for a Legacy Character, in the form of her sister. She didn't even live long enough to even reunite with said sister, let alone having her true origin revealed to her: she was a princess from a underground kingdom who was given human form (of Terra, oblivious of the fact that Terra was evil), who was ultimately kidnapped by the Time Trapper and mindfucked into thinking she was from the year 2001 as part of an underground group of rebels fighting against the mad son of Donna Troy.
All the way back in 1942, Fiction House's Rangers Comics changed its focus from supehero stories to more down-to-earth stories involving American soldiers. The Rangers of Freedom, the super-hero team, became ordinary army rangers. Most of them got bayoneted off-panel before the story ended.
A villain example occured in the Spider-Man miniseries, The Hobgoblin Lives. Jason Macendale, the second Hobgoblin and major villain for nearly two decades, was quickly shot and killed in one page in order to make way for the original Hobgoblin to return. The writer was Roger Stern, the creator of the original Hobby. He was disappointed that his original version of the character had a bridge dropped on him as well (not to mention that Stern left Marvel Comics before he could reveal who the Hobgoblin really was). Despite this, Jason Macendale was still a popular villain and should have been powerful enough to avoid his death or at least survive it.
The original Hobgoblin later had a bridge dropped on him as well. After being bugged to bring him back for 12 years, the writers brought him back for one issue, at which point he was promptly beheaded so that his gear could be stolen and his killer could turn into the new Hobgoblin. This is the subject of quite a bit of Fanon Discontinuity.
And recent solicitations reveal that he is indeed coming back, so the bridge missed him for now.
Toxin (or more specifically his host, Patrick Mulligan) was murdered by Blackheart and the Toxin was conficated, only to be forced onto Eddie Brock by Crime Master
Banshee was regarded as dying like this when Vulcan crushed him with the Blackbird, as were several mutants killed after House of M. The fanbase is not pleased that at least one major character is killed each story.
Dr. Octopus died during The Clone Saga. His death happened thusly: He's sitting in a police car. And then Kaine comes and kills him. And then Kaine jumps away.
This happens to Ethan Rayne in the comic adaptation of Buffy the Vampire Slayer. He's shot by the bad guys while imprisoned, prompting him to disappear from a dream sequence he's helping Buffy with. She walks into his cell, taunting him, only to find him dead.
The sad story of heroine Mystek ended with this. Created by Christopher Priest and was intended to be have her own mini-series, DC Comics asked Priest to insert her into Justice League Task Force to churn up interest. However, DC decided to turn down the idea of the mini-series, leaving Priest with a most-likely unwanted character. So, he promptly makes her claustrophobic, panics and ends up getting shot out of an airlock in her panic.
The Sonic the Hedgehog comic did this to almost the entire echidna population with everyone except for Knuckles and Dr. Finetivus are trapped and apparently wiped out within the Doctor's Warp Ring.
Transformers: Wings of Honor: While most deaths got some dramatic tone to them (Dion and Magnum got The Hero Dies, and Metalhawk's death marked the point of no return for Onslaught), Over-Run got his helicopter dropped on top of him and Ironfist (while Ironfist survived, Over-Run didn't). The Stealth team also got hit with this. After an entire narrative focusing on their adventures, they come to base and get caught right up in the climax, Powerflash dying offscreen, and Tap-Out's corpse being seen once the battle was over. A deft shot later kills Rumbler in the second arc.
In the Runaways arc "Home Schooling", someone fired a missle at the Runaways' home, killing Old Lace and triggering a violent episode from Klara. Later, Old Lace's partner Chase gets hit by a car. Apparently, the story arc was supposed to end with the resurrection of Gertrude Yorkes, but it would seem someone at Marvel was displeased with the increasingly dark tone of the arc, so the whole series was put on a hiatus, and the events were later minimized.
Kid Eternity had just joined the Teen Titans during Sean McKeever's run, but was quickly and unceremoniously written out in a following arc by Bryan Q.Miller. Eternity was kidnapped by the Calculator, as apparently it was felt by editorial that he was too "overpowered" of a character and would interfere with the Blackest Night event. His status remained vague and up in the air until it was later revealed that the Calculator had tortured him into constantly summoning his dead son's spirit, and then when his powers burnt out, brutally beat him to death. To make the death even more ridiculous, the Titans would not express any concern for their teammate or remember his existence until a much later arc in JT Krul's run, where the Calculator reveals Eternity's death to them.
GI Joe IDW did this to the entirety of the Ninja Force (generally considered an embarrassment from the Dork Age of the toy line and the unfortunate final days of GI Joe A Real American Hero Marvel); having them brutally murdered during the 'Cobra Civil War' arc as part of a competition by contenders for the Cobra Commander position to see who could kill the most Joes.