Steroids contributed to the shocking and sudden death of bodybuilder George Peterson ... autopsy results, obtained by TMZ Sports, revealed.
In the documents, officials say Peterson died due to "sudden cardiac dysrhythmia due to hypertensive cardiovascular disease." They note in the docs that "anabolic steroid use" was a contributing factor.
Officials ruled the manner of death as "natural."
He was just 37 years old.
As we previously reported, Peterson -- aka "Da Bull" -- was found dead in October in Orlando .