A Fort Duchesne man was killed in a rollover Tuesday afternoon in Uintah County and a Sandy resident died Saturday afternoon in a truck-bicycle accident on Highland Drive in Salt Lake County.

And a Salt Lake man, Charles C. Arthur 37, remained in critical condition with head injuries in LDS Hospital following an accident Tuesday evening on north Beck Street in Salt Lake City.DEAD:

Steven Brock, 23, Fort Duchesne, who was killed in the one-vehicle rollover near Fort Duchesne.

James D. Jackman, 36, who was killed when the bicycle he was riding collided with a pickup truck that was attempting to pass another car.

A Utah Highway Patrol dispatcher said Brock, who was not wearing a seat belt, died about 6 p.m. Tuesday when he was pinned under a vehicle that careened off a road and landed on its top in a canal about five miles northeast of Fort Duchesne.

Ephraim Dutch Pawwinnee, 37, Fort Duchesne, driver of the vehicle, was treated at Duchesne County Hospital and released. Pawwinnee was booked by Fort Duchesne tribal police for investigation of disorderly conduct, said Fort Duchesne Police officer Stanley Littlewhiteman. He said Nathan Merrick of the Bureau of Indian Affairs is investigating the incident.

The accident was investigated by Highway Patrol Sgt. Dave Jacobsen.

Jackman was killed about 1:15 p.m. Saturday at about 7700 S. Highland Drive when a northbound truck apparently swung into his lane to pass a car at about 7700 S. Highland Drive. Jackman was traveling south down a hill.