A judge in McKinney on Thursday sentenced 18-year-old Seth Dorris of Wylie, a day after convicting the teen of manslaughter.
The Dallas Morning News reports prosecutors say Dorris threw the first punch in the 2009 attack that killed Jonathan Bird of Wylie. Investigators say Bird was outside, on a lawn, when he told several youths in a truck to slow down in the neighborhood.
Three other teens charged with murder face trial next year. Another teen pleaded guilty to aggravated assault with a deadly weapon and spent time in juvenile custody.
Wylie is about 20 miles northeast of Dallas.