Investigators have not given a motive for the killings, but the question of whether steroids played a role has lingered. Anabolic steroids were found in Benoit's home and tests showed Benoit had roughly 10 times the normal level of testosterone in his system when he died.
Some experts believe use of testosterone can contribute to paranoia, depression and violent outbursts known as "roid rage." Benoit's father, Michael, believes years of head trauma his son suffered in the ring contributed to the killings.
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