Doesn't work that way in Canada. In 2010, a 37-year-old male got 6 years for sucker-punching a 62-year-old male who made advances toward him in bar in the Vancouver west end (lotsa gays there). The 62-year-old fell, hit his head, and died as a result.
Best way to shorten a murder sentence seems to be to just do it with your car. It's crazy what people seem to get away even if they're clearly deranged, drunk, and blowing through red lights etc..
Oh, especially now in British Columbia with "no fault insurance". At-fault drivers cannot be sued by victims, unless they are convicted of a crime in connection with the incident.
If you can make the vehicular homicide look like an accident, you are scot-free, except for increased insurance premiums. No criminal charges, and no civil case to face.
152km/hr in a 60 zone, drunk, on film saying "I ain't stopping for no red lights", deliberately sped up as he was about the hit the guy, didn't stop afterward, left the scene, then called in to falsely claim the car was stolen, and had been previously convicted of sexual assault. 5 years less time served, 5 years after with no license. I guess the only way you could really top that list is if he continued on to say "hey lets hit that guy and see how far he goes"