LATEST: Wrestler CHRIS BENOIT's hard knocks in the ring turned the tragic star into a crazed killing machine, according to new tests. The former World Heavyweight Wrestling Champion took his own life after killing his wife and son at the family home in June (07) - and now toxicology results show the fighter was deeply troubled. A press conference has been scheduled for later on Wednesday (05Sep07), but early reports suggest experts will conclude Benoit suffered from chronic brain trauma, which triggered huge emotional swings. The diagnosis is common in the sports world, especially with boxers, American footballers and wrestlers, who take regular poundings on the field and in the ring. The trauma can lead to depression and dementia and erratic behaviour. Benoit, 40, suffered a pattern of concussions during his wrestling career.