Paul Holes is an American former cold-case investigator for the Contra Costa County Sheriff's Office. Holes is known for his contributions to solving the Golden State Killer case using advanced methods of identifying the killer with DNA and genealogy technology. Since retiring in March 2018, Holes has contributed to books, television, and podcasts about the Golden State Killer and true crime.

Joseph James DeAngelo Jr. is an American serial killer, serial rapist, burglar, peeping tom, former police officer, and former mechanic who committed at least 13 murders, 51 rapes, and 120 burglaries across California between 1974 and 1986. He is responsible for three known separate crime sprees throughout the state, each of which spawned a different nickname in the press, before it became evident that they were committed by the same person.