TOWN OF SPRINGFIELD, Wis. -

A 36-year-old Madison man was killed in a motorcycle crash Sunday night, according to the Dane County Sheriff's Office.

The crash occurred on Highway 12 near Highway 19 at about 9: 15 p.m. and a passing motorist discovered the scene at about 6:30 a.m. on Monday. The westbound lanes of Highway 12 were affected during the morning commute. The scene was cleared at 12:29 p.m.

Investigators said the motorcyclist was traveling south on Highway 12, and excessive speed appears to have caused the crash, according to deputies.

The man was not wearing a helmet and was pronounced dead at the scene, according to deputies.

The name of the motorcyclist is being withheld pending the notification of family members.

Highway 12 at Highway 19

Highway 12 at Highway 19