Prosecutors say 18-year-old Travis Joel Harmon of Celina was operating a truck involved in the reckless driving dispute.
Jonathan Bird of Wylie was attacked after telling several youths to slow down while driving through the neighborhood.
Harmon pleaded guilty to manslaughter and was sentenced Wednesday to six months in jail and 10 years of deferred adjudication probation.
The Dallas Morning News (http://dallasne.ws/JRSSz4 ) reports Harmon, who apologized to the victim's family, must also pay the funeral costs.
Harmon is dyslexic and has been diagnosed with Asperger's syndrome.
Three other teens have been sentenced over Bird's death, with penalties ranging from probation to 24 years. Another youth who pleaded guilty awaits sentencing.