The teen pleaded guilty Tuesday to murder over the November death of 19-year-old Octavius Lanier.
Investigators say four juveniles were charged with capital murder after Lanier was shoved off a Dallas Area Rapid Transit train platform. Prosecutors say the 14-year-old boy apologized in court during the plea agreement hearing.
He'll begin serving his sentence at a Texas Youth Commission facility. The boy could be moved to a Texas prison unit when he turns 16, or paroled after three years in the TYC.
A judge last Friday ruled that another defendant, who's 15, will not be tried as an adult. Cases are pending against two other boys.
