Styx (2007)

Investigator Mukaev is found severely beaten in the park. He completely lost his memory. Back at work, Mukaev learns that he was hunting a serial killer before the attack. Shortly before this incident, Mukaev had suspended everyone from conducting the case and only he had all the information about the case. Resuming the search for the maniac, the investigator learns that all the victims were once his mistresses...It soon turns out that someone is deliberately setting him up, planting evidence confirming his guilt. The atmosphere in the investigation team is heating up... The circle narrows, and then the hero realizes that he is at the center of suspicion, and it is better not to return to his past life...

Unfortunately the movie Styx is not yet available on HBO Max.