NEW ORLEANS - A New Orleans state judge has sentenced a man convicted of killing a good Samaritan who tried to stop a carjacking to 45 years in prison.

On Friday, Orleans Parish Criminal District Court Judge Darryl Derbigny chose to spare 21-year-old Kendall Harrison a guaranteed life prison sentence and granted him the chance of parole after 45 years.

Harrison was convicted of second-degree murder in the death of Harry "Mike" Ainsworth, who died in front of two of his children in January 2012 in Algiers Point, a New Orleans neighborhood.

Derbigny followed a mandate handed down by the U.S. Supreme Court that has forced Louisiana judges to consider sparing youthful offenders the finality of life in prison without parole.