MADISON, Wis. -

A 21-year-old man was sexually assaulted in a bathroom at East Towne Mall by a convicted sexual offender who was recently released from prison, according to a release from Madison police.

The victim told police he had a casual conversation with Gregory S. Ostern, 43, before entering a public bathroom Saturday afternoon. He said Ostern followed him and he assumed he also needed to use the bathroom.

Ostern forcefully grabbed the man’s private areas and told him he had just gotten out of prison, according to police.

The man broke free and called police.

Ostern was found walking on Commercial Avenue and told an officer he had been staying in shelters since he was released from prison.

Ostern was arrested on suspicion of second-degree sexual assault.

Madison crime stories from the past 12 months - locations are approximate