GREAT FALLS, Mont. -

A 27-year-old Poplar man has been sentenced to nearly four years in federal prison for crashing a car while under the influence of drugs, killing one passenger and seriously injuring two others.
    
The U.S. Attorney's Office says Tyrone Welch was sentenced on May 23 by U.S. District Judge Brian Morris in Great Falls. Welch had earlier pleaded guilty to involuntary manslaughter and two counts of assault resulting in serious bodily injury.
    
Prosecutors say Welch fell asleep while driving on U.S. Highway 2 west of Poplar on Thanksgiving Day 2012. The car went off the road and rolled several times. Roosevelt County officials said the crash killed 47-year-old Kara O'Lette RedDog. A 26-year-old man and a 28-year-old woman were injured.
    
Court records say Welch's blood tested positive for methamphetamine, marijuana, amphetamine and oxycodone.