Forensic psychology expert witness Dr. Robert C. Engle testified Wednesday in the U.S. Circuit Court of Appeals in Boise on the competency of convicted murderer Joseph Duncan. The hearing will determine whether Duncan was competent when he waived his right to appeal his death sentence in 2008. Duncan was sentenced to death for kidnapping and torturing two Idaho children before killing one of them. Dr. Engle has worked in hospitals, university counseling centers, children’s clinics and his own private practice.