COLUMBUS — Authorities in Columbus have arrested a 22-year-old man who they say stabbed his roommate. Police say the suspect stabbed the 19-year-old woman in a house near Ohio State University around 2 p.m. Thursday. Investigators say the altercation started when the suspect threatened a man who was visiting. Police say the suspect then stabbed his roommate in the neck after the visitor ran out of the house. Investigators say the suspect fled the scene when police arrived.