Byron Blanchard and 18-year-old Joshua Hogarth were out drinking before being kicked out of a bar in August 2012 for fighting.
Blanchard was initially charged with second-degree murder in Hogarth's death.
With credit for time served, Blanchard still has four years and three months to serve.
The victim's mother, Debbie Hogarth, says she is disappointed with the plea deal.
But she says she’s happy the court process is over and wants to move on with healing after losing her son. (CHQR)