Armed with DNA evidence that links his father to the Zodiac killer, Gary forges ahead trying to uncover his truth. Meanwhile, a San Francisco based private investigator digs into Susan and Gary's claims. The questions that have haunted Gary for decades culminate in an unexpected end.

• Kief Davidson
• Ross M. Dinerstein
• Elisa Bonora

• Kyle deCamp
• Gary L. Stewart
• Jude Gilford