movie detective tracking killer turns out to be killer

A daily job a killer turns out to take a mysterious turn.

Police track a murderer.

When Otto's derailed on his way to becoming the city’s youngest detective, he stays in the police business as a bioremediation specialist cleaning up after a serial killer. With an uncanny knowledge of horror films and his natural​-born instincts, Otto​, and ​his pregnant girlfriend Lex​, crack the code to where the killer is going to strike next…now they just gotta catch him.

A police detective initially believed to have died in an accident is found to have been murdered, and suspicion arises the killer is a fellow officer.

A police officer hunts down a vicious psycho / serial killer.

Taiwanese movie

A serial killer targeting the city's mobsters taunts police with clues and photos left behind at the crime scenes. A veteran cop takes on a rookie partner hoping to crack one last case before retiring. As the web of deception and lies unravels, the truth slowly begins to reveal itself.

Investigating a murder is hard enough. But when detectives realize the killer knows how to stage a crime scene to throw them off, the job gets even more difficult. They’re hunting down criminals who are sworn to protect and serve -- killers with a badge.