Michael Thomas Harrison

Pinal County Sheriff’s Office

A high-risk sex offender was arrested Thursday for failing to register when he moved to homes in Marana and Tucson.

Michael Thomas Harrison, 38, a Level 3 offender was arrested in Tucson where he had been living for about a month. He was booked into the Pima County jail and faces charges of failure to register as a sex offender in both Pima and Pinal counties, Sgt. Pat Ramirez, spokesman for the Pinal County Sheriff’s Office, said in a news release.

An investigation into Harrison began Feb. 28 when his vehicle broke down in the Oracle area and a Pinal County deputy stopped to assist him.

“Harrison is subject to sex offender registration in Arizona after being convicted of attempted sexual assault of an 88-year-old woman in Pima County in 1999,” Ramirez said. “Harrison was registered as living in the San Manuel area, but when questioned by the deputy, admitted that he had been living near Marana for two days.

“The deputy became suspicious that Harrison had failed to register as a sex offender, but due to a lack of evidence, Harrison was released that night.”

The deputy followed up with the Pinal County sheriff’s Sex Offender Registration and Tracking unit, which launched an investigation.

Detectives learned Harrison had moved from his registered address several months earlier, and had lived at different addresses in Marana and Tucson without registering. They also learned Harrison may have been in possession of marijuana and a handgun even though he is a prohibited possessor, Ramirez said.

On Thursday Pinal deputies working in cooperation with the Pima County Sheriff's Department and the United States Marshal's Service arrested Harrison as he was leaving his Tucson apartment.