PANAMA CITY, Fla. -- A registered sex offender from Georgia has confessed to killing a 13-year-old Panama City girl whose body was discovered by a maid in an area hotel room, police said.

Mathew Caylor told investigators late Thursday that he had killed the girl, Melinda Denise Hinson, two days earlier, according to Police Capt. Robert Colbert. He said the girl's body was found Thursday in a room registered to the 33-year-old Caylor.

"It was a very detailed and very lengthy confession. Investigators will be working in the coming days to validate every component," Colbert said.

Caylor, of Auburn, Ga., is charged with murder, sexual battery and failing to register as a sexual offender. He is being held in the Panama City Jail.

He was arrested by the Bay County Sheriff's Office on Wednesday after he was accused of attacking and attempting to rob two women at a Panama City Beach condominium.

At the time Hinson's body was found, Colbert was being held at the Bay County Jail on charges including aggravated assault, false imprisonment, fugitive from justice and failure to register as a sex offender.

Investigators had Caylor transferred to the Panama City Jail for questioning Thursday night. Colbert said Caylor has a lengthy history of petty crimes and sex crimes that includes numerous misdemeanor charges and two felony charges.

Hinson and her family had moved to Panama City from Kentucky in November and were living at the hotel. Caylor checked into the hotel on June 28.

Hinson's family reported her missing late Tuesday after she left to walk a neighbor's dogs and did not return to the family's hotel room.

Authorities said they are awaiting autopsy results on how Hinson was killed.