David Berkowitz, also known as the Son of Sam, killed six people and injured a number of others during his 13-month shooting spree in 1976 and 1977. Here is everything to know about the survivors of Berkowitz’s attacks.

The serial killer’s voice in previously unreleased 1980 recordings provides the hook to director Joe Berlinger’s documentary, which also offers interviews with detectives, survivors and others connected to or obsessed with the case.