TOMAH, Wis. (WKBT) -

The Monroe County Sheriff says one person suffered serious head injuries in a motorcycle crash late Wednesday night.

According to a press release, 63 year old Dana Crohn of rural Camp Douglas was on a motorcycle heading east on County Highway N in the town of Tomah, and was unable to avoid a deer in the road.

The sheriff says Crohn was first taken to a Tomah hospital, then to a hospital in La Crosse for serious head injuries.  Crohn was not wearing a helmet.

An investigation is underway.