07/17/2007 at 05:00 PM EDT
Chris Benoit injected himself with testosterone before killing his wife and son and then committing suicide last month, officials said Tuesday.
Daniel Benoit, 7, was sedated with Xanax, a drug used to treat anxiety disorders and panic disorders, when the World Wrestling Entertainment star strangled his child. Xanax was also found in the body of Benoit's wife, Nancy.
The findings were presented by Georgia's chief medical examiner, Dr. Kris Sperry, who cautioned that there is no scientific evidence linking testosterone to fits or rage or mental disorders. He did say that the levels of testosterone in Benoit's body were "elevated."
Testosterone is a hormone that maintains muscle mass and strength, fat distribution and bone mass, as well as sperm production, sex drive and potency.
Police say the wrestler, 40, killed his wife and son
in their suburban Georgia home before strangling himself with a weight machine cord on June 24.
Following Benoit's death, federal Drug Enforcement Administration agents arrested his personal physician, Dr. Phil Astin, on seven counts of over-prescribing pain and anxiety medication. (Astin has pleaded not guilty.)
Although none of the charges are related to Benoit, a search warrant obtained earlier by police specified the doctor had prescribed "on average, a 10-month supply of anabolic steroids to Mr. Benoit every three to four weeks from May 4, 2006 through May 9, 2007."
Steroids were found in the wrestler's house on the day the deaths were discovered, according to police. Astin denies prescribing steroids to Benoit.
After results of the toxicology reports for Benoit were released Tuesday, the WWE released a statement saying, in part, "On Mr. Benoit's last drug test in April 2007 administered by Aegis Labs, he tested negative for anabolic steroids and for testosterone. Given the toxicology report of GBI released today, it would appear that Mr. Benoit took testosterone sometime after his April 2007 test."
The statement continued: "For over 20 years, the WWE has been demonstrating our concern for the well being of our contracted athletes, instituting drug testing in 1987 leading up to our current Wellness Program which began on February 27,