Howell has a 25-year sentence in Florida for attempted murder and resisting arrest. Watson has a 15-year sentence.
Defense attorney Larry Nance said Watson will begin her life sentence in Tennessee after she finishes her prison sentence in Oklahoma. She is expected to appeal.
An appeal of the death penalty is automatic.
Howell moved to Memphis after his release from a Wyoming prison in May 1987 following an eight-year sentence in the robbery-slaying of an elderly motel clerk. BIOG: NAME:Archive ID: 401925