A Casper man admits that he attacked two designated drivers that were trying to help him.

Twenty-two year old Preston Wisenbaker has pleaded 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, Wisenbaker attacked with a knife.

As part of a plea deal, prosecutors will seek no more than a two-to-four year prison sentence.

Wisenbaker is being held on $10,000 bond and will be sentenced at a later date.