SACRAMENTO, Calif. (AP) — Gov. Jerry Brown is again blocking parole for a former leader of the Mexican Mafia prison gang who now helps law enforcement.

Brown rejected releasing 53-year-old Rene “Boxer” Enriquez on Thursday, saying the gang dropout is at risk of being killed if he is freed.

Enriquez has said he would enter the federal witness protection program if released. But Brown says there’s no evidence Enriquez has been accepted into such a program.

Enriquez has been in prison since 1993 serving a sentence of 20 years to life for two murders, multiple assaults and drug trafficking conspiracy.

He published a tell-all book about the Mexican Mafia.

Last year, Los Angeles police cleared a downtown building so Enriquez could speak to law enforcement and business leaders about the gang.

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