An Ogden woman and a Layton man were killed in separate accidents this week.

On Tuesday, 78-year-old Mary Deats was hit and killed by a car while crossing busy Harrison Boulevard near 15th Street in Ogden.

Police said the accident happened about 10 p.m. when Deats was attempting to cross the road and was struck by the car, which tried to avoid her.

"There were no crosswalks," Ogden Police Lt. Scott Sangberg said Wednesday.

The woman died at McKay-Dee Hospital. No one has been cited. Ogden police said they were still trying to determine who's at fault.

"We won't know until the investigation is through and screened with the county attorney's office," Sangberg said.

Early Wednesday morning, Curtis Thompson, of Layton, died after falling asleep and crashing his semitrailer truck on state Route 30 in Box Elder County.

Thompson was heading east on the highway about 20 miles southwest of Park Valley when he apparently dozed off and then overcorrected, said Utah Highway Patrol trooper Cameron Roden.

"There was a pretty steep lip that caused him to roll," Roden said. "The driver was not wearing a seat belt and was ejected out of the semi."

Another driver came across the wreckage about 7:30 a.m. Officials believe the crash happened an hour or two before that.