Preston Hanson, 26, was charged in the December 2006 death of Nathan Medwid.
Medwid, who was 19 at the time, died when the car the two were driving in rolled near the community of Sylvan Lake.
They were both ejected from the car.
Justice Monica Bast of Court of Queen's Bench acquitted Hanson because she said the Crown failed to prove beyond a reasonable doubt that he was behind the wheel.
Both Hanson and Medwid were formally from Swan River, Man. (CHUB, CKGY)