A sex offender who is accused of abducting, raping and killing an Ohio State University student was on GPS monitoring.

Brian L. Golsby, 29, who was released from state prison on Nov. 13 after serving six years for robbery and attempted rape, had special conditions of supervision under his post-release control for five years.

"I can confirm that he was on GPS monitoring, which is not uncommon due to the fact that he did not have a permanent residence upon his release," said JoEllen Smith, a spokeswoman for the Ohio Department of Rehabilitation and Correction.

Golsby was living in a state-contracted residential housing program that granted him a temporary residence.

Grove City police arrested Golsby after 21-year-old Reagan Tokes' body was found on Feb. 9 near the entrance of Scioto Grove Metro Park. Detectives say Golsby abducted Tokes after she left work Feb. 8 in the Short North. He forced her to withdraw $60 from an ATM, raped her and fatally shot her twice in the head before dumping her body. Investigators already had Golsby's DNA from prior offenses and matched it to a cigarette butt left in Tokes' car.

Tokes was set to graduate from OSU in May with a degree in psychology.

Smith said state law prevents her from going into details of the conditions Golsby had to follow. All offenders are prohibited from carrying guns, but it's unclear whether travel restrictions were placed on Golsby in addition to what sex offenders have to abide by.

"DRC contracts with community providers for electronic monitoring and GPS services. The level of monitoring depends on the offender and circumstances for which the service is requested," Smith said.

She would not specify which vendors are used or describe the level of monitoring that offenders like Golsby could have. It's unclear whether he triggered an alert while wearing the bracelet, or, if he had discarded the monitor, how parole officers would have been notified. It's also unknown how often parole officers check the movements of offenders assigned to them, or how far back the monitor records travel.

"DRC is not providing specifics relative to this case due to the ongoing criminal investigation," Smith said.

Columbus police have been looking at Golsby as a possible suspect in a series of attacks on women in German Village and near Nationwide Children's Hospital.