PALATKA, Fla. -- The Putnam County Sheriff's Office is asking for help finding a woman who is missing and who might be a victim of a crime.

Deputies said Brenda Horn, 31, was with her boyfriend, Kenneth Mike Tilley, of Daytona Beach, when she disappeared.

Tilley told investigators that they stole a car in Volusia County on Friday night and drove through Putnam County into Clay County. Deputies found Tilley on Sunday morning, passed out in that car, parked along U.S. Highway 17.

Tilley told Clay County investigators that he was using methamphetamine, he got into an argument and he beat Horn.

"He said 'I believe we had an altercation and that I beat her badly and probably left her for dead behind a convenience store, and I believe in Putnam County," Putnam County Sheriff Dean Kelly said.

Deputies took Tilley to Hall's Superette and Deli in Bostwick, which he identified as being the store.

Deputies did not find Horn or any sign of a struggle.

"When he was arrested, he was under the influence of methamphetamines, so we're not sure how accurate his memory is," Kelly said.

The owner of Hall's Superette told Channel 4's Jim Piggott that he was at the store Saturday night and didn't see or hear anything suspicious.

Deputies checked around other convenience stores in the area, but there was no sign of Horn. They have also made contact with Horn's family and former employer, but no one has heard from her since Saturday.

Tilley is being held in the Clay County Jail on a DUI charge while the case is being investigated.

Anyone with information about Horn's whereabouts is asked to call the Putnam County Sheriff's Office at 386-329-0800.