A D.C. man who shot and killed two men in 2011 in a dispute stemming from a robbery was sentenced this week to 82 years in prison, prosecutors announced.

Irvin Johnson, 27, was convicted in February in D.C. Superior Court in the slaying of Jimmie Simmons, 32, and Dominique Barbour, 31.

The victims, prosecutors said in a news release Thursday, were shot execution-style, in the head, on July 9, 2011, in Northwest Washington. A third man Johnson shot in the head and chest survived but committed suicide a year later.

Johnson also was found guilty of several other crimes, according to the announcement from the office of U.S. Attorney Ronald C. Machen Jr.

Just before he was sentenced Thursday by Superior Court Judge Lynn Leibovitz, prosecutors said, Johnson yelled: “Just throw the book at me and be done with it. I got things to do.”