Arthur Leigh Allen (December 18, 1933-August 26, 1992) was the prime suspect in the case for The Zodiac Killer. Allen was cleared through DNA Comparison and handwriting samples.
Arthur Leigh Allen died on August 26, 1992 of a heart attack in his home in Vallejo. Ironically, one of the CHP officers who wrote a book about the case was Allen's childhood friend. They graduated from High School together.
However, the retired CHP officer was also wrong when he pointed the finger at a 91-year-old man in Solano County, California.