SAN ANGELO, Texas (AP) - Prosecutors are asking a Texas judge to put off a bigamy trial for polygamous sect leader Warren Jeffs.

In a motion this week with State District Judge Barbara Walther, Assistant Texas Attorney General Eric Nichols asked that a pretrial conference set for next week be delayed until late 2012 considering Jeffs already is serving life plus 20 years in prison for two counts of sexual assault of a child.

Nichols said his request was made "in light of judicial economy concerns."

The bigamy trial was set for February.

According to the motion, the 56-year-old Jeffs has no lawyer. The bigamy charges against the leader of the Utah-based Fundamentalist Church of Jesus Christ of Latter Day Saints are related to one of the two underage girls in the August assault trial.