Published: Mar 20, 2012 10:33 PM EDT

LEE COUNTY, Fla.- Robert Cope was sentenced to 15 years in prison Monday for the 2009 killing of a North Fort Myers resident, according to the State Attorney's Office.

The victim's head had been cut off.

Cope plead no contest to Manslaughter on a Disabled/Elderly Person.

The defendant had several mental health issues, but was ultimately found competent enough to plea.