MILWAUKEE (CBS 58) -- We’re now learning more about the mental state of a Milwaukee man who’s charged with shooting and killing three of his neighbors. 

The third day of Daniel Popp’s trial is going on Wednesday. A doctor who evaluated Popp multiple times after he was arrested says he was not mentally competent when he committed the crime.

Popp is accused of shooting and killing his neighbors back in 2016. He has already pleaded no contest so it’s now up to the jury to determine if he is not guilty by reason of mental disease or defect.

The defense attorney called psychologist Dr. Deborah Collins to testify who says Popp believed he was being followed, that a chip was placed into his head, and that he made other comments she calls delusional.