His son, Bear Updyke, told AL.com that he died of natural causes in Louisiana on Thursday.
He was 71.
He was sentenced to serve at least six months of a three-year sentence for criminal damage to an agricultural facility, the Lee County District Attorney said at the time.
As part of the sentence, he was put under five years of supervised probation, including a ban on attending any collegiate event or stepping on Auburn University property.
Auburn police arrested him for dousing the landmark trees on the edge of the Auburn campus with herbicide so potent that agronomists said they had little to no chance of survival.