Investigators have confirmed that the prison death of convicted murderer and doctor Martin MacNeill in April was a suicide, according to recently released investigative reports. MacNeill, 61, died on April 9 at the Utah State Prison, where he was serving a lengthy sentence for killing his wife, Michele MacNeill, and sexually assaulting their adult daughter weeks after his wifeâs death. The former doctor was found deceased by two prison inmates near a greenhouse in the Olympus section of the pris... <iframe src="http://www.sltrib.com/csp/mediapool/sites/sltrib/pages/garss.csp" height="1" width="1" > </frame>