An X-ray technician was held without bail on charges he murdered nine young women since May, and authorities said they may have found the 10th victim of an alleged serial killer.

Robert J. (Bobby Jo) Long, 31, of Tampa, was arrested Friday on first-degree murder charges, said Hillsborough County Sheriff Walter Heinrich. Long, on three years' probation for aggravated assault, also was charged with the rape, abduction and sexual assault of a girl, 17.

As Heinrich announced the arrest in a news conference, he stopped to say that deputies had found the body of Vickie Marie Elliott, who had been abducted from Tampa earlier this month.

That brought the number of possibly related slayings in the area since May to 10, investigators said. Long has not been charged in that death.

Earlier, authorities had linked only four of the victims and had said they believed a single killer is responsible for those murders. Each victim was found on a Sunday and each had been seen the night before in bars and nightclubs along North Nebraska Avenue in Tampa.

The nude body of Kim Marie Swann, 21, a vocational student, was found Monday along a busy Tampa roadside. She was the ninth woman slain in what officials saw as a possible similar pattern since May 13