Atlanta ? The father of pro wrestler Chris Benoit said Friday that he was eager to see whether chemical tests can help explain why Benoit killed his wife and son and committed suicide, acts the wrestler’s father said he had no clue were coming.

Michael Benoit said by phone from his home in Canada that his family is shocked and in disbelief over the slayings.

“We have no understanding of why it happened,” he said. “We need some time to gather our thoughts and wait and see. There’s still more information that’s going to come out from toxicology tests that will give us some understanding of why this happened.”

Anabolic steroids were found in Chris Benoit’s home in an Atlanta suburb, leading officials to wonder whether the drugs played a role in the killings, which took place last weekend. Some experts believe steroids can cause paranoia, depression and violent outbursts known as “roid rage.”

On Friday, for a second time, federal agents raided the office of a doctor who prescribed testosterone to Benoit. The agents did not say what they were looking for or what they found.

Chris Benoit strangled his wife and 7-year-old son, placing Bibles next to their bodies, before hanging himself on the cable of a weight-machine in his home, authorities said.

Investigators had not yet discovered the bodies Monday when someone altered Benoit’s Wikipedia entry to mention his wife’s death, authorities said.

An anonymous user with the same IP address as the person who made the edits confessed early Friday on an online discussion page attached to the Web site, saying the changes were based on rumors and speculation, not hard evidence.