Bruce McGregor Davis was born in Louisiana on October 5, 1942 and raised in Mobile, Alabama, the younger of two children of a family that moved frequently after his parents separated. He finished school, attended college intermittently, and drifted west, working in Arizona before reaching southern California. He spent seven months in Europe and North Africa in 1968 and 1969 as the guest of a group of young women, and returned to join Charles Manson at Spahn Ranch.
He was convicted in 1972 of the first degree murders of Gary Hinman, the music teacher killed at Topanga in July 1969, and Donald Shea, the Spahn Ranch hand killed the following month, and sentenced to death. The sentence became life when California's death penalty was struck down. He was not charged in the Tate or LaBianca killings, though he was present in the Family throughout that period.
In prison he became an evangelical Christian, took a doctorate in the philosophy of religion, married and had a daughter, and worked for many years in the chapel. The California parole board found him suitable for release on seven occasions from 2010 onwards and every one of those grants was reversed by a governor: first Schwarzenegger, then Brown, who reversed grants in 2013 and 2014, then Newsom, who reversed the January 2021 grant on the ground that Davis still lacked a comprehensive understanding of how he came to take part in such violence. In July 2022 the pattern broke and the board itself denied him parole, the commissioners finding a minimisation of personal responsibility, which was the first denial after more than a decade of grants. His hearing of January 18, 2024 was continued when commissioners raised two interviews he had given to a true-crime podcast; the board took the matter up again on August 8, 2024 and denied parole for three years, with Gary Hinman’s cousin and niece and Debra Tate among those attending for the victims. He remains in prison, in his eighties, and is next eligible in 2027 unless a petition to advance the hearing succeeds. His lawyer has argued throughout that he is among the most rehabilitated prisoners in the state and that he would have been released years ago had the case not carried Manson's name. His is the standard California example of the governor’s reversal power. Steve Grogan, convicted with him in the Shea killing, led investigators to Shea’s remains in 1977 and was paroled in 1985, the only Family member convicted of murder to have been released.
The claim that he was the Zodiac Killer is a separate matter and is not established. It was advanced principally by the researcher Howard Davis and taken up on Zodiac discussion boards, on the strength of geography, timing and Davis's refusal to cooperate with questions about other unsolved Los Angeles killings of the 1960s. No physical evidence, handwriting comparison or law enforcement finding supports it, and this archive does not treat it as a fact. The magazine's own article on the subject is a first-person account by a researcher advancing the theory, and should be read as that.