A Waterloo man has been arrested for stabbing another man in a bar fight, according to the Waterloo Cedar Falls Courier. 26 year old Ryan DeLeon Martinez was arrested on Tuesday and charged with Willful Injury Causing Serious Injury. He got into an argument with Jesus Hernandez Cordero at El Coyote bar on June 3rd. DeLeon produced a knife and stabbed Hernandez in the upper left chest before fleeing the scene. Hernandez was taken to the hospital and determined to have a punctured lung. DeLeon is being held on a $50,000 bond.