A man who acknowledged killing three people at a Colorado Planned Parenthood clinic is returning to court for a hearing on whether he's mentally competent to continue with his criminal case.

A psychologist who examined 57-year-old Robert Dear is scheduled to testify Tuesday.

Dear is charged with 179 counts, including murder, attempted murder and assault, in the Nov. 27 shootings at the Colorado Springs clinic. Nine people were injured.

In court, he has declared himself a "warrior for the babies" and said he was guilty.

The hearing started last month, when two psychologists testified that Dear isn't mentally capable of understanding the court proceedings and helping in his defense.

If the judge agrees, Dear's case would be put on hold while he undergoes treatment at a psychiatric hospital intended to restore his mental competency.