Were steroids responsible for crimes committed by Cullen Mutrie?

Police officers came to Cullen Mutrie for a drug investigation. This ma shot five police officers at his home. As a result of the shootout, the Greenland Police Chief Michael Maloney  was killed; 4 police officers were wounded. The next morning Cullen Mutrie and a woman were found dead.
It is suspected that Mutrie was applying anabolic steroids at the time of the shootout. Jane Young, the New Hampshire Associate Attorney General, stated that toxicology reports were waiting in order to find out whether metabolites of steroids were in the body of Cullen Mutrie.
Police officers affirmed that Mutrie had been a muscular person. He worked at Genetix Fitness in Seabrook. It was reported that he was 6 feet 3 inches tall. Cullen Mutrie weighed 275 pounds. During a raid that was in July 2010 police officials found anabolic steroids at his home. The police officer Wayne Young saw them in a coffee table. He said that he had observed a plastic bag with several vials. A vial was with powder; others contained liquid. The labels indicated that they were steroids.
The New Hampshire State Crime Lab analyzed the vials. It was reported that the vials contained Trenbolone Acetate, Sustanon 250, Boldenone Undecylenate and Nandrolone Decanoate.
John Miller, a professor of kinesiology, was asked whether a connection between the deadly actions and “roid rage” of anabolic steroids could present. The professor confirmed that it was plausible. But according to him, it is impossible to confirm that there was a direct link between usage of anabolic steroids and the crime.
John Miller supposed that steroids that were on the black market were provided from legitimate pharmaceutical companies. But he has been mistaken because the majority of steroids that are sold on the black market are produced in underground labs. It is even suspected that Mutrie produced steroids.
Since a link between crimes and steroid use is a controversial issue, not only policemen but also media investigates the case related to this shootout.