WEST ALLIS, Wis. (CBS 58) -- A 24-year-old West Allis man has died after crashing into a pontoon boat being towed on I-90/94 near Lake Delton. 

Wisconsin State Patrol says it happened around 10:40 p.m. Monday night, Sept. 21.

Authorities say when the man hit the vehicle towing the boat, the impact dislodged the pontoon boat from its trailer. The truck rolled several times and the driver died of his injuries.

State Patrol says he was not wearing a seatbelt. 

The other driver, a 69-year-old Adams man, was not hurt in the crash.