A Marshalltown man was arrested Monday in a felony assault incident in which the victim was critically injured. It happened in the 200 block of West Church Street after reports of a fight were received. An adult male was found whose named has not been released, he was taken to a medical facility locally and then airlifted to Des Moines. The suspect is identified as 23 year old Wyatt Slinker of Marshalltown who was charged with Assault Causing Serious Injury.