Nathaniel W. Snider, 714 Clark St., was booked into Walla Walla County Jail Wednesday on investigation of second-degree assault.
Walla Walla Police believe Snider stabbed Ryan E. Reesman, 37, of Walla Walla at the Clark Street home early Tuesday.
According to a police report, Reesman was admitted Tuesday at Providence St. Mary Medical Center for a collapsed lung as a result of being stabbed. Hospital staff contacted police.
Reesman told police he went to the home and got into an argument with Snider over whether Reesman should leave. Another man living at the home was not involved in the confrontation, police said.
As the fight escalated, Reesman told police he felt as if he'd been struck in the side, and left. When he got home he realized the severity of his injury, and his roommate took him to the hospital.
Snider was arrested at his residence Wednesday, but released from the County Jail on house arrest this morning with conditions that include no drug or alcohol use. No formal charge has been filed, but the matter remains under investigation.