A LaPorte man is heading to federal prison after pleading guilty to being a felon in possession of a firearm. David Diederich, 58, was sentenced last week to 3 years and 5 months in prison, one year of supervised release and fined $1,000. Court documents indicate Diederich possessed an Empire Ejector shotgun while in LaPorte County. He was convicted of a felony in 1976 in St. Joseph Superior Court.