BISMARCK, N.D. (AP) — A North Dakota man with a history of drunken driving has been sentenced to 15 years in prison for a crash that left two people dead and two people injured.

South Central District Judge Sonna Anderson says 29-year-old Riley Plenty Chief, of Cannon Ball, could be sent back to prison for up to 20 years if he violates probation after his release.

The Bismarck Tribune reports that Plenty Chief pleaded guilty to two counts of criminal vehicular homicide and two counts of criminal vehicular injury.

Authorities say Plenty Chief was drunk when he caused a head-on crash south of Mandan last year that that killed 55-year-old Glen Todd Fox and 36-year-old Nation End of Horn, both of Fort Yates.

Plenty Chief was convicted twice of drunken driving in 2011.