(AP) — Gov. Jerry Brown again blocked parole Thursday for a former leader of the Mexican Mafia prison gang who now helps law enforcement, discounting claims that the double murderer intended to enter the federal witness protection program. Enriquez, who turns 54 next week, has been in prison since 1993 serving a sentence of 20 years to life for two murders, multiple assaults and drug trafficking conspiracy. Enriquez testified at his February parole hearing that he quit the gang in 2002 when he realized members were killing children and innocent relatives of gang members who fell into disfavor. Enriquez has been cooperating with authorities for 14 years, earning more than 60 letters of support from the FBI, local law enforcement officials, and state and federal prosecutors. [...] the Los Angeles District Attorney's Office opposed his parole request, and relatives of his victims testified that his cooperation cannot take away their pain.