WASHINGTON, Ind. — Police say an Ohio man accused of having sex with a corpse told investigators he didn’t at first realize the woman was dead.

Fifty-five-year-old Richard Elwood Sanden of Geneva, Ohio, was being held on $500,000 bond Wednesday in the Daviess County Jail in Washington, Ind., on charges including abuse of a corpse and possession of marijuana.

The Washington Times-Herald reports police arrested Sanden on Saturday night after they were called to the dead woman’s apartment.

The newspaper reports Sanden told police he was having sex with the 48-year-old woman whom he had known for a few months when he realized she wasn’t breathing. He told police he administered CPR and called an ambulance.

The woman’s cause of death remains under investigation.