R. v. Beatty, 2008 SCC 5
Click here [3] to link to the full judgment.
(Criminal law / Criminal negligence / Dangerous operation of motor vehicle causing death)
While driving, B's vehicle crossed the centre line and hit another vehicle, killing three occupants of the other car.  Evidence showed that B was not intoxicated, there was no mechanical failure, and B had been driving normally immediately before the collision.  There was no apparent reason for B's vehicle to cross the centre line.  The Court found that B's momentary lapse of attention was not sufficient in the circumstances to constitute a marked departure from the standard of care required by the Criminal Code.  B was acquitted.
Majority/Concurring/Concurring: 5/3/1