West Valley City police were investigating a motorcyclist's fiery fatal collision with a semi-trailer rig late Friday morning.
Police Lt. Dalan Taylor said the accident occurred just before 11 a.m. at 4580 S. 4000 West. The motorcyclist was later identified as Jay Nielson, 39, of Holladay.
The semi was northbound on 4000 West when it crashed with the motorcycle in the intersection. It was not immediately known what direction the biker was traveling.