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Kristin Murphy, Deseret News
Salt Lake City police work at the scene of an accident near the intersection of Redwood Road and 500 North in Salt Lake City on Thursday, July 5, 2018.

SALT LAKE CITY — Salt Lake City police believe a 75-year-old man likely suffered a medical episode before side swiping a semitrailer Thursday morning.

The incident happened about 9:15 a.m. near 500 N. Redwood Road. Witnesses told police that the man was slumped over his steering wheel before he hit the semi. He was transported to a local hospital in extremely critical condition and was not expected to survive.

The man's name was not immediately released.