Defense attorneys have finished making their case that a convicted murderer should be sentenced to life in prison and not executed for kidnaping, raping and killing an 8-year-old Topeka girl.

The Topeka Capital-Journal reports clinical psychologist June Cooley of Atlanta testified Monday that Billy Frank Davis Jr. has bipolar disorder with psychotic features and post-traumatic stress disorder. She says his symptoms worsened when he stopped using his prescription medication and began drinking alcohol and using cocaine.

Under cross-examination, Cooley acknowledged that Davis was dangerous.

Davis was convicted last week of 10 counts, including capital murder, in the May 2012 killing of Ahliyah Nachelle Irvin.

The defense rested its case after Cooley testified. Jurors will begin deliberating his sentence after the defense and prosecution make closing arguments.