The 55-year-old man was convicted in 2008 of having sex with a body awaiting autopsy. In 2009, he was charged with assaulting the bodies of two other women's bodies at the Hamilton County morgue in 1991.
The more recent charges are based on DNA evidence. Prosecutor Joe Deters told the Associated Press the case is "just beyond belief."
"I'm sure there are more," he said. "I'm certain of it, but we'll never be able to prove it."