Once convicted of second-degree murder in the killing, Frank Prater, who belonged to a motorcycle club in Stockton, pleaded guilty in October to a manslaughter charge after his murder sentence was overturned.
He is expected to serve about five more years in prison. Though his sentence was for 11 years, he gets credit for already serving several years behind bars.
Robert Memory, a fellow biker who was originally convicted of manslaughter in the killing, will serve one more year in prison after he ended up pleading to assault with a deadly weapon after his own conviction was overturned.
The fight occurred during a fight outside a Stockton bar. Prater originally said that he stabbed Donahue, the son of a former Tracy middle school principal, in defense.