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The Sun of London reported that police found “evidence of heavy drinking” at Mr. Pistorius‘ home. The sprinter reportedly once almost shot a friend in a restaurant when the gun he was holding accidentally discharged, and in November posted on Twitter that he mistook his washing machine for a burglar.

“The idea that you’re using a steroid and the next thing you know you are becoming an irrational monster is a myth,” Mr. Collins said. “There is a connection between steroids and aggression, but it’s not a direct, causal one. It’s an association, and very hard to specify why it exists.

“Human behavior is extremely complex. What we do is often a result of a combination of many factors, and simple cause-and-effect notions are very rarely founded.”