MINNEAPOLIS (AP) — The attorney for a man accused in connection with a car crash that killed the son of the University of Minnesota men’s hockey coach and another young man says mechanical failure might have been a factor.

James Blue, of Orono, is charged with third-degree murder, drunken driving, and negligence in the July deaths of 20-year-old Mack Motzko, son of Gophers coach Bob Motzko, and 24-year-old Sam Schuneman.

The victims were passengers in the Bentley that the 51-year-old Blue is alleged to have driven at up to 99 miles per hour before crashing into a wooded area. The Star Tribune reports that in addition to possible mechanical issues, defense attorney Frank Bruno says that “speed discrepancy” will be a key issue in the case.