A Waterville man has died after a raft flipped over while whitewater rafting on the Kennebec River in northern Maine.

Maine Warden Service Sgt. Scott Thrasher said a raft operated by North Country Rivers was carrying six people and a guide when it turned over in a river rapid at about 11 a.m. Thursday in Indian Stream Township.

Thrasher said 58-year-old Thomas McDermott was unresponsive when he was pulled back into the raft. He was later pronounced dead.

The incident is under investigation, and the medical examiner's office has been called in to determine the cause of death.