Investigators believe a 67-year-old man concealed his mother's decomposing body at their home in rural northwestern Wisconsin for years so he could continue to receive her $1,100 monthly social security checks.
Deputies went to the house in Washburn County in June after a postal worker contacted authorities because mail had not been collected. WQOW-TV reported Wednesday that they found Michael Egan's body on a bedroom floor. He had been dead for more than a week.
Cadaver dogs later found the remains of his mother, Elizabeth, on a couch under rags, sleeping bags and plastic.
Investigators don't know how long Elizabeth Egan had been dead but say she was last seen in 2005 when she was 95 years old.
The Associated Press contributed to this article.