Julian Daley was among five New Jersey teenagers charged in connection with the death of Divyendu Sinha.
Sinha, 49, his wife, Alka, and two sons were out for a late-night walk on June 25, 2010, near their home when they were attacked, Hunterdon County Democrat reported.
Sinha was punched in the head and died three days later at Robert Wood Johnson University Hospital in New Brunswick. His two sons had minor injuries, and his wife was not hurt.
Daley, who was 16 at the time of the crime, was sentenced to the maximum of 15 years in prison by New Brunswickon Superior Court Judge Bradley Ferencz on charges of aggravated manslaughter and conspiracy to commit aggravated assault.
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"It is important also to note that there must be a clear, concise message sent to the community that one should be free to walk in one's community, to walk with one's family, free from physical attack," Ferencz said.
He also was sentenced to five years on an unrelated burglary charge, which will run concurrent to the 15-year sentence. Daley must serve 85 per cent of his sentence before he is eligible for parole.
Daley had entered into a plea bargain with the state in exchange for his testimony at other trials.
Conway pleaded guilty to aggravated manslaughter and conspiracy to commit aggravated assault. Tinli and Johnson went on trial in August, and in a September verdict were found guilty of one charge, simple assault on Sinha's sons.