Sheila R. Starr, 24, acknowledged she and boyfriend Antonio Cordell Mendoza beat the man at her apartment, then put his body in the car trunk, according to a court affidavit filed by a Norman police detective.

She said she drove the victim's Saturn from her apartment while Mendoza followed in another car, then set the Saturn ablaze by the lake, according to the affidavit.

Although a motive has not been disclosed, the detective reported the victim's relatives and others said the victim "had socialized with" Starr in the past.

Police also reported phone records show the victim called her number from his cell phone three times between 2 and 2:45 a.m. on Nov. 15. A witness called 911 at 4:47 a.m. the same day to report the car on fire.

Starr and Mendoza, 23, of Oklahoma City, were arrested Nov. 21. A third suspect, Michael Anthony Shields, 36, of Oklahoma City, was arrested Tuesday. Norman police reported in a news release that Shields confessed to his part in the killing. No additional arrests are expected.

All three suspects were being held Saturday in the Cleveland County Jail, according to sheriff's office officials there. Oklahoma County prosecutors said they will be charged in Oklahoma County.

The 46-year-old victim has been identified by different last names. He was identified as Julian Ramirez Cazarez in Norman police news releases, but police affidavits identified him as Julian Cazares Ramirez and Julian Ramirez Cazares.

Starr is on probation for a marijuana offense. She told police that she and Mendoza moved after the killing, according to the affidavit.