GRENADA, Miss. — A three-day manhunt for a kidnapping suspect in Mississippi ended Sunday evening with the suspect shooting himself to death after a standoff with authorities that shut down Interstate 55 for several hours.

The Mississippi Department of Public Safety says 38-year-old Christopher Paul Dulas of Hattiesburg kidnapped his estranged wife last Thursday.

Department spokesman Warren Strain says in a news release that a search led authorities on Sunday to the Desoto National Forest. A tip led them to an RV park in Grenada, where the woman was safely rescued Sunday afternoon.

Dulas drove away in a truck pulling a recreational vehicle. He lost control of the vehicle as deputies fired at it on an Interstate 55 entrance ramp.

Strain says the ensuing standoff ended when Dulas shot himself.

I-55 was shut down in both directions around 4 p.m. Sunday and was re-opened around 8:15 p.m.

State police confirmed that a Special Weapons and Tactics team was called in. Witnesses told The Clarion-Ledger newspaper that they saw a dozen Mississippi Highway Patrol vehicles speeding to the scene Sunday afternoon. One reported that the trailer at the site matched a description put out by authorities searching for Dulas.

Strain says Dulas was a United States Army trainer assigned to Camp Shelby in Hattiesburg.