ST. AMANT — A motorcyclist was killed early Monday on La. 429 in Ascension Parish when he drove off the road and struck a utility pole, Louisiana State Police said.

Jim Thoman, 55, had been riding his 2010 Harley Davidson motorcycle along La. 429 in St. Amant when he drove off the highway west of La. 22 shortly before 6 a.m., Trooper 1st Class Bryan Lee said in a news release.

Thoman, who is from St. Amant, was not wearing a U.S. Department of Transportation approved helmet and suffered fatal injuries when he hit the utility pole, Lee said.

The Ascension Parish Coroner’s Office pronounced him dead at the scene.

Lee said it was not known whether Thoman was impaired by drugs or alcohol but a blood sample will be taken for analysis.