A woman once acquitted in the death of her boyfriend has pleaded guilty but mentally ill to charges she killed another boyfriend, whose body was found stuffed in a freezer. Marjorie Diehl-Armstrong, 55, of Erie, was sentenced to seven to 20 years in prison Friday for third-degree murder and abuse of a corpse in the August 2003 shotgun slaying of live-in boyfriend James Roden, 45. Diehl-Armstrong had denied killing Roden, blaming a friend who later admitted he helped her clean up the crime scene, dispose of the shotgun and store Roden's body in a freezer at his home.