(KSL News) -- The Utah Highway Patrol says driving while drowsy likely caused a fatal crash.
A Layton family was driving north on I-15 near Nephi this afternoon.
The car swerved off the road; the driver overcorrected; the car then rolled several times and hit the median.
The impact ejected and killed the driver.
Three passengers went to the hospital. One was in critical condition, the others in serious condition.