Mordenti was last seen in Punta Gorda, Florida on May 22, 2008. He was living with his grandmother in the Pirate Harbor community at the time. On May 20, two days before his disappearance, he was arrested for loitering and prowling after someone called the police about someone attempting to break into parked vehicles. Mordenti was bonded out of jail on May 21. He was very depressed at the time of his release, and disappeared the next day. At 7:00 p.m., his grandmother noticed Mordenti wasn't in his room and the outside door was open. He has never been heard from again. He left behind his medications and cellular phone. He hasn't used his cellular phone, credit cards or MySpace account since his disappearance.

Mordenti previously lived in Spring Hill, Florida. His case remains unsolved.