A 22-year-old man who plowed his pickup truck into a troop of Girl Scouts picking up trash on the side of a Wisconsin road, killing three girls and one woman, was sentenced Wednesday to 54 years in prison.

Colten Treu pleaded no contest in December to four counts of homicide by intoxicated use of a vehicle and guilty to one count of hit and run causing bodily harm. He had originally pleaded not guilty to all charges.

On Wednesday, he addressed the families of his victims.

"I screwed up bad. No matter what I say or do, you guys are never going to know how sorry I really am," Treu said, according to NBC affiliate WEAU. "I can't give back what I have taken. I want to. Lord knows I want to."

A judge ordered that Treu's 54 years in prison be followed by 45 years of extended supervision. He has been credited 495 days for time served.