BOULDER, Colo. (AP) — Authorities say a 34-year-old Nebraska woman struck and killed by a vehicle during the Ironman Boulder race this past weekend in Colorado had veered outside the designated race lane.

Michelle Walters died Sunday morning after being hit during the event’s bicycle race on U.S. 36 north of Boulder.

Colorado State Patrol Trooper Nate Reid tells the Daily Camera (https://bit.ly/2auMLFu) that Walters veered outside of the coned-off race lane and into the traffic lane where she was hit by a pickup truck.

Walters died at a hospital.

The driver of the truck was not injured and no citations were immediately issued.

Reid said it is not clear why Walters veered from the designated race lane.

The accident is still under investigation.