Body Count

Overview
It's about a serial killer with terminal cancer who leaves numbered cards on his victim's bodies, a girl who falls in love with him, a loser cabbie who becomes the prime suspect, an old asshole police sergeant, and a radio reporter who takes the law into his own hands.
Similar
Taxi Driver (1976)
Psycho (1960)
Frenzy (1972)
Arsenic and Old Lace (1944)
Saw II (2005)
Night of the Zodiac (2022)
Slumber Party Massacre (2021)
The Man Without a Face (1950)
Maniacts (2001)
The Strangers (2008)
The Watcher (2000)
Henry: Portrait of a Serial Killer (1986)
American Psycho II: All American Girl (2002)
Bloodstream (1985)
Valentine (2001)
Halloween: The Curse of Michael Myers (1995)
Taxi (2004)
A Short Film About Killing (1988)
The Frighteners (1996)
The Texas Chainsaw Massacre: The Beginning (2006)