Derek Robert Spence
Leonard Murdock, 25, was convicted of manslaughter last month in the August 2010 killing of 24-year-old Derek Spence.
Jurors heard Spence was killed moments after pummelling Murdock's friend outside a Winnipeg home.
Spence and three friends went to confront Murdock's friend for allegedly ripping Spence off of $10 earlier that night.
After beating the man, Spence advanced on Murdock and raised his arms in a challenging gesture, jurors were told.
Murdock, who claimed he was acting in self-defence, stabbed Spence once in the chest, piercing his heart.
Prosecutors had recommended Murdock be sentenced to eight years in prison, while defence lawyer David Soper argued a five year sentence was appropriate.
Justice Diana Cameron credited Murdock for time served, reducing his remaining sentence to approximately 4 1/2 years.