Beneath Suspicion / Witse

Witse uses this trope so often, that it deserves a page in its own right. Watch out for spoilers!

• The pilot episode, "De ommekeer", uses this trope to its full effect for the second and third murder (the first murder was commited in plain view and had little to do with the other two). While all of the murders were quickly linked to a dangerous gangster at large by the federal police, the killers turned out to be the second victim's wife and her secret lover (who appeared for 2 minutes tops before the reveal), who killed the gangster to steal his money and subsequently killed the husband to get rid of him.
• The killer of the episode "Afscheid" wasn't the guy who (vigorously) stalked the victim, nor her new (and somewhat peculiar) lover, but her new lover's brother, who was defrauding his clients and at risk of being exposed by the victim. His involvement was only revealed several minutes before the end of the episode.
• While he did not have anything to do with the original crime, the (serial) killer of the episode "Lieve oudjes" was Patrick Gijsbrecht, who was helping the police as a witness.
• The killer of the episode "Bijklussen" was Wim de Coninck, the victim's neighbour, who was having an affair with the victim's wife. Not only was he a loving husband with a pregnant wife, but he also barely received any screen time before the reveal.
• The killer of the episode "Loesje" was Peter Vansina, the father of the victim's girlfriend (the eponymous "Loesje"). He was also the person at the suicide helpline who took the victim's call and subsequently killed the victim due to threats of blackmail, after which he got the police involved himself.
• The killer of the episode "Monica's passie" wasn't the man she had an affair with (who had recently returned), nor the pastor she had dirt on or the contruction worker who lusted after her. Instead, Monica's killer was her cuckholded husband, who killed her in a jealous rage over an (alleged) affair she never had.
• The killer of the episode "Meubelland Paulus" turned out to be Raf Persoons, the right hand man of the victim's father and former bookkeeper of the company, who killed the victim because she discovered his Penny Shaving fraud. Not only was Raf the one who found the victim the next morning, he was also the most helpful character of the entire bunch. Understandibly, he was revealed as the murderer in the last five minutes of the episode, while not being a suspect at any point before that.
• The killer of the episode "Pancha Karma" was Steve Olano, whose wife had an affair with the victim. The entire affair, however, was only revealed in the last ten minutes of the episode, along with the killer's knowledge of said affair. Up to that point, several other suspects (including some disgruntled clients) had passed the revue, while Steve was mainly considered as an acquaintance of the victim.
• The killer of the episode "De groene jongen" was the victim's boss at the agricultural department, who had discovered that the victim had found out about a fraudulous land purchase the killer was going to make. The killer initially wanted to bribe the victim, but ended up killing him instead. He only came in view during the last ten minutes of the episode, with the main suspect being farmer Ansoms up to that point.
• The killer of the episode "De lustige weduwe" wasn't family's matriarch, who the victim cheated on with her own granddaughter, nor the granddaughter (who was seen running away from the crime scene), nor the son (and factory's CEO), who got swindled by the victim. Instead, the killer was the grandson, who also (secretly) had a relationship with the victim and who had become aware that the victim was cheating on him with his sister. This is only revealed in the final five minutes of the episode. It's made even more ironic by the fact that both the matriarch and the granddaughter confessed to the murder to protect one another.
• The killer of the episode "De drenkeling" was the victim's son-in-law, who drowned the victim after convincing the rest of the family that the victim had already died from a blow to the head, dealt by the victim's wife. Not only was he the person with the least obvious motive (he did it for the inheritance, instead of spite or self-defense), but he was also the last one for the police to suspect, as he wasn't there at the (alleged) time of the murder.
• The killer of the episode "Burengerucht" wasn't the man who had an affair with one of the victims, nor the criminal (ex-)boyfriend of the family's daughter, nor the daughter herself (who had spent time in rehab), but the family's son, a straight A student, who seemingly had no motive to shoot his parents, until it was revealed (in the last five minutes) that his sister had lied about her father having raped her in the past few years.
• The killer of the episode "Inch' Allah" wasn't among any of the suspects that were on the teams radar near the start of the episode. Instead, it turned out to be one of the victim's past girlfriends, who got blackmailed by the victim to get back together with him. It took quite some digging (and another murder) to get Witse and the team on the right track by the end of the episode.
• The killer of the episode "De eenzaat" wasn't the eponymous "eenzaat", who had been the prime suspect since the beginning, but the victim's best friend, Thomas, who accidentally killed him during a friendly game of stickfighting. Furthermore, the "eenzaat" was killed in revenge, but not by the victim's father (who had been seen near the crime scene), but by Dirk, a family friend and Thomas' dad. Both only came into view during the final five minutes of the episode, with Thomas being revealed as the killer via video tape to his father, after he had confessed his crime to the police.
• The killer of the episode "Diabolo" was Paul Bastelaere, the head priest of the congregation all of the victim's belonged to. Not only was he never a suspect for the murders (until the end of the episode), but he also tried to "help" the team with their investigation. He even got one of his parishians to confess to one of the murders to throw the team of the scent and ended up killing three people because of it.
• The killer of the episode "Tweespoor" wasn't the victim's girlfriend (who had cheated on her with an ex-boyfriend), nor the ex-boyfriend (who had plenty of motive as well), nor the victim's boss (who was committing financial fraud and was afraid the victim would expose him). The killer, instead, was the ex-boyfriend's wife, who appeared in one scene, had no motive to kill the victim (she had killed her by mistake) and had a bullet-proof alibi for the night of the murder (until Witse, by chance, discovered that it was false).
• While no one got murdered in the episode "Veel liefs uit Rusland", the perp still fell under this trope. Throughout the episode, a teenage girl gets kidnapped for ransom and nearly everyone involved in the case is under suspicion at some point: the victim's mother, the victim's uncle, a garage owner working with the Russian maffia... The true kidnapper, however, eventually turns out to be Alex Stuyck, a mechanic at the garage, who was trying to get revenge on the victim's father for getting his father sent to a Russian jail (he also needed the ransom money to liberate his father). Not only was Alex never a suspect, but his relation to the case was figured out less than 10 minutes before the end of the episode.
• The killer of the two-parter "De val" was none other than John Mariman, a sleazy ex-lawyer, who acted as an (unwilling) informant to Witse throughout the two-parter and appeared in no more than two scenes before being revealed as the killer. Not only was he never on Witse's radar (nor on the radar off the police, who suspected Witse), but he would have been a forgetable character, if not for the fact that he was played by Frank Focketyn. It, hence, took Witse about 90% of the two-parter to determine that Mariman was the killer, with the realization even coming as a shock to him.
• The killer of the episode "De perfecte moord" was Sven Gabriëls, an intelligent (and rich) college student, who killed the victim for no other reason than to commit the perfect murder. Not only was he never suspected, but he would have gotten away with it, if it weren't for the clues he left behind on purpose. The only reason Witse eventually began to suspect him, was because he left clues to his last name (Gabriël) and even then, he would have walked away scot-free, if it weren't for an indiscretion during his final interrogation with Witse. Then again, with an episode named "The perfect murder", this trope would be mostly par for the course.
• The killer of the episode "Dodenrit" turned out to be Laurent Defraye, the doctor who tried (and failed) to reanimate the victim, after his heart gave out due to an amphetamine overdose. Not only were there other suspects who had a motive (such as a disgruntled teammate, the cycling team's leadership and the doctor's son, who bought performance enhancers from the victim), but the doctor's involvement was revealed very late into the episode, when Witse visited his own GP and asked him about some bruises on the victim's ribs, which turned out to be the result of the doctor intentionally botching the victim's heart massage.
• The killer of the episode "Het Landjuweel" was Sandra, a good friend of Annemie and the person who had invited her and Witse to the fatal play. Her motive for the murder was the fact that the victim, a surgeon, had (inadvertently) killed her five-year-old nephew during an operation. This connection, however, wasn't made until somewhere near the end of the episode, with the case even being labeled as a tragic suicide at one point. Furthermore, the killer was sleeping with one of the detectives on the case (Billy Redant), which led to his removal from the team.
• The killer of the episode "De dorpsgek" was Wim Verdonck, a personal trainer who was presumed dead for most of the episode. It turns out he commited the murder under instruction of Julie, the co-owner of the gym he worked at, who wanted her husband removed. Her involvement, however, did not fall under this trope.
• The killer of the episode "De pyromaan" isn't the eponymous pyromaniac, nor his violent brother or the victim's wife. It's the daughter-in-law, who murdered the victim in self-defense (as he tried to rape her). She wasn't suspected until the last five minutes of the episode.
• The killer of the episode "De regel van drie" was Anton, the father of woman that was raped by the three murder victims. He only appeared once before the reveal, no longer than two minutes, and was promptly forgotten until the reveal after that. He was, quite literally, the last person the team suspected.
• The killer of the episode "Obsessie" wasn't Frank Mussen, a known fraudster, or Marcel Puissant, a dangerous loan shark, but Philippe, the doctor of the victim's wife (and an old friend of Sam), who had fallen in love with her and wanted her husband gone.
• The killer of the episode "Nachttrein" was Steven de Rooy, the bartender at a cafe near the train station. He was initially only questioned as a witness during the door-to-door investigation and wouldn't have come into frame if not for a few minor details which tipped Witse off. Even then, proving that he was the killer took some serious risk on Sam's part.
• The killer of the episode "De goede moordenaar" wasn't Fons, the guy who initially confessed to the murder, nor the victim's wife or love rival, but Tony, Fons' nephew, who was paid by the victim's love rival to kill the victim. The victim's love rival is also a minor case of this, as he was the kindest character of the lot.
• The killer of the episode "De brouwerij" was the pregnant fiancé of one of the victims, who received a pocket dial from her fiancé, who was plotting her murder with the second victim. The killer subsequently killed both victims in self-preservation. Not only was she never suspected, but she only became an actual after the actual voicemail message of the murder ploy reached Witse and his team. Until then, the team was busy enough investigating the plethora of other suspects involved in the case.
• the killer of the episode "The Connection" was Karel Meeuws, a friendly mechanic who worked at the victim's company. Not only did he (seemingly) not have a motive for murder, but he managed to kill a second victim before he got arrested. He also got quite friendly with Sam as well.
• The killer(s) of the episode "Duivelskoppel" wasn't the victim's fiancé, not the victim's son, who both stood most to gain, but, instead, the victim's personal assistant and the victim's driver, who had a relationship and were in it together. Their motive was the victim's wealth, which they would obtain through a false will they made (in the victim's handwriting). Neither of them were suspected of the murder (in the driver's case, because he had confessed to fencing wine) and they only gained a motive after the will reading, which took place in the final five minutes of the episode.