Toschi served at the police department from 1952 to 1987. From 1966 to 1978 he was assigned to the S.F.P.D. homicide detail. He was best known for his role as a chief investigator in the Zodiac Killer case, which he and partner, Inspector Bill Armstrong, began to work on after the murder of taxi driver Paul Stine.
- "40 years of Zodiac – The cold case that haunts Dave Toschi". City Brights: Duffy Jennings. 2009-10-08. Retrieved 2017-12-03.
- "Ex cop who led Zodiac Killer case inspired Steve McQueen's Bullitt". Mail Online. Retrieved 2017-12-03.
- Fagan, Kevin (10 January 2018). "SF cop who hunted Zodiac killer dies. Dave Toschi was 86". SFGate. Archived from the original on 11 January 2018. Retrieved 11 January 2018.