By Jack Douglas Jr., CBS 11 News

DALLAS (CBSDFW.COM) – A 14-year-old boy, standing next to his mother, was sentenced Thursday to 22 years in prison for his role in the killing of a man at a Dallas DART station last November.

Juvenile Court Judge William Mazur Jr., moments before delivering the sentence, became emotional as he scolded the boy for wasting his youth.

Octavious Lanier was killed two days before Thanksgiving last year when he was pushed into the path of a DART train while being beaten and robbed by four youths at the MLK terminal.

The boy in court Thursday pleaded guilty and apologized to Lanier’s family. Family members for both the victim and the boy broke down in tears when the judge announced sentencing.

Moments earlier, Lanier’s mother delivered an emotional statement to the court.

Two of the other young attackers, ages 13 and 14, have already been sentenced to 30 years in prison, while a 12-year-old boy was sentenced as a youth and can remain behind bars no longer than seven years, when he turns 19.

The boy sentenced Thursday was seen on a surveillance camera pointing out their victim and then kicking Lanier in the face as he lay on the ground.

That same camera, however, showed that he was not involved in pushing Lanier in front of the moving train.