(Portland, OR)  --  A sex offender from California is awaiting sentencing, after pleading guilty to manslaughter in the 1988 death of a Southeast Portland woman.  Walter Wayne Howard was initially charged with murder in the death of his one-time neighbor, 25-year-old Renee Harvey, at her Southeast 27th Avenue apartment.  Howard pleaded guilty in Multnomah County Circuit Court to first-degree manslaughter, and will be sentenced later this month.  Police say Howard was arrested in San Diego in 2014 after DNA found at the scene of the killing was determined to have matched his.