The Sun reports investigators found steroids, a "blood-stained cricket bat," and "evidence of heavy drinking" at his mansion in Pretoria, South Africa.
The 26-year-old track runner, famous for being the first Paralympic athlete to compete in the regular Olympics, is being tested for drugs as cops probe whether 'roid rage was a factor in the murder of the 29-year-old Steenkamp — who was gunned down through a locked bathroom door on Valentine's Day.
New evidence suggests she was shot once in the hip before she escaped the bathroom, then struck three more times as she hid inside. She also suffered a crushed skull.
Pistorius has claimed he mistook Steenkamp for an intruder.
The City Press of Johannesburg published this graphic detailing the theorized sequence of events: