Warren Jeffs was sentenced to life in prison on Tuesday after a jury deliberated for only 30 minutes.

The polygamist sect leader was convicted last week on two counts of sexually assaulting a 12-year-old and a 15-year-old who were his "spiritual wives." The jury sentenced him to life in prison for the first count of aggravated sexual assault and 20 years for the second count of sexual assault plus a $10,000 fine. The sentences were the maximum allowed for each count. The judge ruled that the sentences be served consecutively.

On Monday, the two sides rested their cases, without the defense calling any witnesses.

Earlier Monday, jurors weighing punishment for Jeffs heard audio recordings that prosecutors say show he had sex with underage girls and encouraged group sex.

At times difficult to hear, one of the tapes recorded sounds of two people apparently engaging in intercourse. Other recordings captured Jeffs instructing what prosecutors say were underage girls in how to please him. Girls could be heard giggling in the background.

Jeffs, the leader of the Fundamentalist Church of Jesus Christ of Latter-day Saints, was charged after a 2008 raid on a ranch his church operates near Eldorado, Texas.