Legendary rocker Frank Zappa's longtime bassist Roy Estrada has been sentenced to serve 25 years behind bars for child abuse.

The 68 year old, who served time in a California prison for committing a lewd act with a child, is back in jail for molesting a child younger than 14 over an extended period of time, according to RollingStone.com.

Melody McDonald, a spokeswoman for the Tarrant County, Texas district attorney's office, tells the Fort Worth Star-Telegram newspaper, "The victim's family was unaware that he was a convicted sex offender... Estrada was sentenced to 25 years in a plea bargain agreement and is not eligible for parole. He will be 93 years old before he is released from prison."

Estrada, who was a member of Frank Zappa's band the Mothers of Invention, is also a founding member of rockers Little Feat.