PHOENIX (AP) — An Arizona man has been sentenced to four years in prison for assaulting a federal officer.

Prosecutors say 39-year-old Jason David Grisham, of Tonelea, was sentenced by a U.S. District Court judge in Phoenix this week.

Grisham had previously pleaded guilty in the case.

Prosecutors say Grisham assaulted a Navajo Nation police officer in Kayenta last June.

The investigation in the case was conducted by the FBI and the Navajo Nation Department of Public Safety.