California Gov. Jerry Brown reversed a decision to grant parole to Bruce Davis, a former follower of Charles Manson.
"When considered as a whole, I find the evidence ... shows why he currently poses a danger to society if released from prison," the governor wrote.
Brown's office had received a formal recommendation from the state board parole Friday to release Davis, 70, who would have been the first Manson "family" member to secure freedom solely for good behavior.
In 2010, Davis secured his first formal recommendation for parole by the state board, but then-Gov. Arnold Schwarzenegger reversed the board's decision.