Are steroids responsible for murder?

Audrey Allen, an 18-month old baby, was killed by Joshua Allen Kruzik.
The baby was murdered because she cried in the middle of the night. Joshua Allen Kruzik, an US marine, a friend of Audrey Allen’s parents, came to them to spend weekends at their friends’ home. Before he came to their place, he was at a local bar where he consumed much alcohol. He had to care about the little girl, when she cried. But Joshua Allen Kruzik beat the little girl too brutally. As a result, the little girl got numerous severe head injuries. The baby died at a local hospital.
David Kohn, the defense attorney for Joshua Allen Kruzik, claimed that steroids were responsible for the aggression of his client. It was stated that Joshua Allen Kruzik administered anabolic steroids. Before the incident he attempted to stop administering these medicines but he was not capable to do it. David Kohn confirmed that anabolic steroids produced “roid rage” in Joshua Allen Kruzik. He couldn’t not control his behavior and beat the little girl. According to David Kohn, Kruzik was unconscious. Although David Kohn claimed that Kruzik was ready to assume the entire responsibility, he added that he was not guilty.
The little girl’s parents also testified that their friend administered anabolic steroids. The mother of the child confirmed that she possessed syringes at her home. So, she injected Kruzik with steroids, when he came. Several other persons also affirmed that he applied steroids.
It is strange that anabolic steroids are demonized in this case. Are these preparations responsible for the murder? Consider that Joshua Allen Kruzik has been drunk, when he has murdered the baby!
It is not clear whether this defense strategy will work.