The caretaker of an Air Force veteran has been sentenced to four years in prison for using the veteran's credit card as he lay buried underneath a Kentucky home for nine months.

News outlets report that 41-year-old Christy Russell was sentenced Monday and ordered to pay back $32,822 in restitution. Russell pleaded guilty in April to fraudulently using 55-year-old Steven Reis' credit card to take advantage of his veteran benefits.

Authorities aren't sure how Reis came to be buried underneath a vacant Dayton home.

Reis' body was discovered in September and authorities believe he died in January 2015. Police said in a statement that an autopsy couldn't determine his cause of death.

Police say others had also lived in the house with Russell, but no one has been charged.