Edison Burgos Montes escaped the death penalty but faces life in prison in the killing of an DEA informant, a Puerto Rican jury decided Thursday, the Associated Press reports .
Montes was convicted in August of killing his girlfriend, Madelyn Semidey Morales, in July 2005.
She was cooperating with a DEA probe against him, the AP reported.
Morales’ mother urged Montes to reveal where the daughter’s body is but to no avail.
A family member maintained Montes was innocent, according to the AP.