SPOKANE (AP) — Authorities in Washington state say they have made an arrest in the slaying of U.S. Sen. Jon Tester's nephew.

The Spokane County Sheriff's Office said investigators arrested 22-year-old John A. Radavich on Thursday evening for investigation of first-degree murder. It was not immediately clear if Radavich had an attorney or someone who could speak on his behalf.

Robert Tester, the 35-year-old nephew of the Democratic senator from Montana, was found dead last Sept. 6, after his 8-year-old daughter reported witnessing the homicide.

The sheriff's office said that in late December, when a friend told authorities that Radavich confessed to the killing in a phone call which the friend had recorded. In the call, investigators said, Radavich claimed he killed Tester because Tester had assaulted a 17-year-old girl he knew.

More From News Talk KIT