Speaking of this, did you ever watch the show Forever Knight?
It was a Canadian series about an 800 year old vampire who works as a homicide detective, in Canada.
Here's the plot as per Wikipedia:
Nick Knight is a Toronto police detective who works the graveyard shift with his partner. Unbeknownst to most of his colleagues, Nick is actually Nicholas, an 800-year-old vampire (his human surname was reference to his status as a literal knight in medieval France). Remorseful over centuries spent as a vampiric cold-hearted killer, Nicholas serves the public good as a policeman. He often uses his special abilities to bring criminals to justice. Whenever he works on his cases, Nicholas remembers similar situations from previous lifetimes which appear as flashbacks in the episodes. Nick explains his need to work on the night shift by claiming to have a skin disorder, photodermatitis, which requires him to stay out of sunlight. Refusing to feed from humans, he survives by drinking bottled animal blood, something that most vampires find repulsive. The only human who knows his true nature is his friend Natalie Lambert, a medical examiner who does not like when he uses his special powers as she believes it increases his need for blood.
Nick's ultimate dream is to find a way to become human once again, but his quest for redemption is complicated by the arrival of fellow vampires Lucien LaCroix and Janette DuCharme. Lucien was a general in the early Roman Empire who was turned into a vampire by his daughter Divia as Mount Vesuvius erupted in AD 79. Lucien made Nick a vampire in 1228. Lucien had already made Janette a vampire. They were Nick's companions for many centuries until he left them, seeking redemption and a way to reclaim his lost humanity. Janette runs a night club, while LaCroix works as a late-night talk radio host. Although Janette is scornful yet tolerant of Nicholas's new lifestyle, LaCroix actively attempts to seduce his protégé back to a more violent life.
During the series, Nick had two partners. For the first two seasons, it is Don Schanke. At the beginning of the third season, Detective Schanke dies in an airplane explosion caused by a bomber, and Nick is assigned a new partner, Tracy Vetter, a rookie detective who receives the assignment due to her father's high-ranking position in the police force. Tracy finds herself increasingly attracted to Javier Vachon, another vampire who had been a conquistador centuries earlier. Nick and Vachon know about each other, and Tracy knows about Vachon being a vampire, but she does not know Nick is also a vampire.
Although Nick continues to protect the "innocent" civilians, he faces circumstances that risk the exposure of the vampire community who, up until this time, were unknown to other humans. He is faced with the choice to either relocate or attempt to recapture his humanity through a method that puts Natalie's life in the balance. At that point, LaCroix appears and indicates the time to leave is near and he must either bring Natalie over or leave her to die. Nicholas decides that neither option is acceptable and hands LaCroix a wooden stake. We do not see what LaCroix does, but we hear him say "Damn you, Nicholas" in stress and frustration, and the scene cuts out to the building where Nick lives and a shot of the sun rising. The ending is left to the viewers' interpretation, but the implication is that Nick dies with LaCroix's help, hoping to join Natalie in an afterlife.
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