MACKINAC ISLAND, MI -- A Texas woman is dead after she fell off her bicycle and was run over by a horse-drawn carriage on Mackinac Island,

police told 9&10 News.

The accident happened on Tuesday on Main Street near the island's public library, and authorities identified the victim as Gail Johnson, of Llano, Tex.

Police say Johnson was pronounced dead at the island's medical center. Authorities were checking to see if she suffered a medical problem before the accident, the television station reported.

Officers on the island could not be reached on Wednesday afternoon.

An autopsy is expected to be performed today, the station reported.