Before he killed himself, Andrew P. Cunanan was nursing an abdominal wound apparently suffered about a week before fashion designer Gianni Versace was killed.

Police found bloody bandages, cotton swabs, gauze pads and penicillin pills in the Miami Beach houseboat where Cunanan ended his life with a gunshot to the head July 23.

"I believe he did have a wound on his stomach, and he was treating himself with the medical supplies found on board," FBI spokeswoman Anne Figueiras said today, adding that she didn't know when, where or how Cunanan was wounded.

The Sun-Sentinel of Fort Lauderdale reported in Thursday's editions that the doctor who performed the autopsy was baffled by the wound and unable to pinpoint how it occurred, except to say that it appeared to be two weeks old. Cunanan killed himself eight days after Versace was killed.

The perfectly round, shallow puncture wound, which was bright red and appeared infected, was below the suspected killer's bellybutton, a source who was not identified told the newspaper.

Earlier in the week, investigators told the Sun-Sentinel that they believed Cunanan may have been hurt in one of the four slayings he is suspected of committing before Versace was killed July 15.

Miami Beach police, who are investigating the Versace slaying and Cunanan suicide, declined to comment on the wound but said that media reports about it had tainted the investigation.

"This medical situation was known only by police and those who knew him," Detective Al Boza said. "This was a way for investigators to know whether those contacting us were providing good information. But we've lost that edge."

In addition to Versace, Cunanan, 27, was suspected in the killings of Jeffrey Trail and David Madson in Minnesota; developer Lee Miglin in Chicago; and cemetery caretaker William Reese in New Jersey.

In an interview on ABC's "PrimeTime Live" tonight, Cunanan's brother and sister described him as a nonviolent, intellectual child.

Christopher Cunanan and sister Eleina Johnson said they were at a loss as to what could have triggered Andrew's violent spree. "He didn't have a violent bone in his body," Christopher said.

And though they had their suspicions Andrew was gay, he was not open about it with the family.

"He was so isolated from us," said Johnson. "He didn't come to family gatherings. In his later years, he didn't come to our Christmases and Thanksgivings."