A Casper man is heading to prison, after admitting he attacked two designated drivers who were trying to help him.

Twenty-two year old Preston Wisenbaker was handed a two-to-four year prison sentence at the Wyoming State Penitentiary, after pleading guilty to one charge of aggravated assault.

According to the Natrona County Sheriff’s Office, in April, the victims were driving Wisenbaker home from a party, when he said he wanted to return and get his vehicle.

They were concerned about his level of intoxication, but decided to return him to the party.

Wisenbaker was escorted while he was driving, but a short time later, he pulled over because of engine problems.

When the victims went to look at the problem, prosecutors say Wisenbaker attacked them with a knife.

He has also been ordered to pay about $8,400 in restitution to cover medical expenses for the victims.

This is Wisenbaker's third felony conviction.