Zoom. Jittery, terrified talking paper collage vegetables in a garbage disposal, waiting and waiting for the horrific moment when the memorably nasty-looking blades would start spinning and puree them all.
Frax's death in Time Force was a Dies Wide Open involving a scream and parts of his robotic face falling apart. This after his having been reprogrammed into a mindless automaton by the Big Bad.
Flashbacks in Wild Force showed vines assault and grow through the bodies of two terrified humans. Apparently, a bloodless death can't possibly disturb anyone.
They actually only got away with this one due to a Channel Hop. They told the first network (Fox) that the characters would later turn out to have survived, which makes it okay somehow. They then "neglected" to tell the second network (Disney) that the death had ever happened, so they didn't have to keep the promise, and they stayed dead.
Ninja Storm had a cyborg villain suffer melting at the hands of another, treacherous villain. His half-slagged body is seen in a rare exception to PR's Everything Fades tendency. His executioner quips that he was "having a little meltdown".
Ninja Storm has one that wasn't the death itself, but... the monster of the week was a pig. The Rangers beat him, he goes giant, they beat him again, he explodes... and then we see Lothor eating his barbecued remains; the other villains were as disgusted as should be expected.
A rather nasty, Mecha-Mooks loophole exploiting death in Zeo where two groups of enemy mooks have a battle royale. The mooks are Tengas (bird men) and Cogs (spandex robots) You see Tengas and Cogs sluggin it out for a few shots, then it cuts to one Tenga holding down a struggling Cog while another Tenga tore open its stomach and ripped out its electronic guts. This wasn't Chouriki Sentai Ohranger footage that slipped past the censors, either - Tengas were Power Rangers-exclusive mooks, so it was all original footage.
Oh my goodness, Zeo. Louie Kaboom, the temporary leader of the Machine Empire. Under a love spell cast by the new villains he takes on the Rangers in combat, and is eventually defeated. However, unlike most of the mindless minions that fell to the Rangers, he remained alive for a few moments, stumbling around in pain while on fire and professing his love for the villain that brainwashed him.
Super Sentai was far worse when it came to this. Especially in the early 80s. In the first episode of Denshi Sentai Denziman, for example, construction workers are skeletonized into piles of sludge and bones. The Big Bad leader's name is Queen Hedrian, after the Japanese word "Hedoro", which means sludge.
The Muppet Show. A large monster eats a smaller, cuter monster while singing a very eerie version of "I've Got You Under My Skin" to his victim. Did the person who came up with that gem have a vore fetish or something?
Even worse is the glowworm sketch, which involves a lizard-esque creature sits on a wall while humming a tune ("Glow Little Glowworm") and eating worms that poke at him until it bites a worm that's actually the nose of a bigger monster that proceeds to eat the lizard. If only Jim knew that people would take that sketch in a different way decades later.
The Swedish Chef was strangled by his own spaghetti bolognese.
And beaten by a sentient pile of dough, shot by a turtle, hit in the head with his own cleaver...yikes.
Through the Dragon's Eye, a 1990s kids' educational series for schools, featured an anthropomorphized quagmire which would merrily drag cast members down to their doom. And this was used in a cliffhanger.
The Big Bad, who happens to take the form of a sort of skeletal bird with an exposed ribcage, wrapped in a black cloak and with Freddy Krueger-style scissor fingers, actually melted several of the secondary characters. Seriously. Into pools of liquid...
They got better. But not until right at the end, weeks later. And kids were actually required to watch this in classes.
While their deaths aren't actually seen, Kenan and Kel, in "Two Heads Are Better Than None", find three severed heads on a table. Of innocent victims. Who had been previously introduced.
Monk is generally a PG-rated, family-friendly show, but the pre-credits sequences often feature gruesome and disturbing death scenes. Usually, ones that involve blood.
Same can be said of Bones, and it's probably so parents can tell the kids to bugger off for the first five minutes and come back after the titles. The show uses up its terror quota nice and early, while the parents get to revel in the Squick, totally guilt-free and without having to worry about sudden violence or unexpected horror later in the program.
This troper would be very worried about any parent with children under the age of 12 or 14 letting said children watch Bones. Despite the fact that the gruesome reveal of the body reliably occurs in the pre-credit sequence, the remains are then shown repeatedly throughout the episode. Also, several episodes have had the killers attack other people, including the main characters, and main characters have become victims themselves.
Caleb's death in Buffy the Vampire Slayer - bisected from the groin up. Being a psychotic, mysoginistic serial killer seems to make this acceptable viewing, however.
SuperMagic PowerMan and Lanolin Lady in The Aquabats Super Show episode "Showtime!" are vaporized using SuperMagic PowerMan's magic headband worn by the young girl they just saved, who turns into Space Monster M.