The Missouri Highway Patrol is investigating a hit-and-run crash Sunday night on Highway 94 in St. Charles County.

The crash happened just before 7:30 p.m. near the intersection of Route F in Defiance, Missouri. Troopers say a driver crossed into an oncoming lane and struck 45-year-old Daniel Helfert of Fenton, who was riding his motorcycle. Helfert was thrown from his bike, and the other driver fled the scene, according to troopers.

Monday night, troopers identified the vehicle involved in the crash and took a person of interest into custody.

Helfert remains hospitalized. His son, DJ Helfert, said doctors amputated the lower part of his father’s leg after the crash.

“He’s pretty upset, but he’s alive, and he’s breathing,” Helfert said about his father. “He remembers taking the mirror off the car with his shoulder. He [doesn’t] really remember the ambulance ride but he remembers coming to in the hospital.”

Helfert went to the scene of the crash Monday, and found one of his father’s shoes and a piece of plastic he believed belonged to the vehicle that fled. He also found a vehicle he thought was involved in the crash parked a few miles away, and reported his findings to troopers.

D.J. Helfert found his father's shoe near the scene of a hit-and-run crash in St. Charles County.

Helfert’s efforts paid off. Highway Patrol investigated several leads Monday, including his, and later identified the vehicle involved in the crash. He hopes drivers will be more mindful of motorcyclists in the future.

“Just watch out for people on bikes,” he said. “You’re in a car and they’re in the open.”

A Gofundme page has been created to help with Helfert's medical expenses.