(Portland, OR)  --  A Portland landlord is headed to prison, after being convicted of killing his tenant with a hammer and hiding her body on his property.  Prosecutors say 63-year-old Gary Lewis pleaded guilty to first-degree manslaughter in the 2014 beating death of Renee Sandidge-Crowell, who was mentally ill.  Lewis initially faced a murder charge in Sandidge-Crowell's death, but came to a plea agreement with prosecutors.  He was sentenced to 16 years behind bars.