Diana Dowse, 59, of Brooklin was headed south on Route 175 about a mile south of the High Street intersection at about 4:25 p.m. when her vehicle collided head-on with a pickup truck operated by Timothy Sawyer, 42, of Brooklin.
Dowse was taken by ambulance to Maine Coast Memorial Hospital in Ellsworth.
Sawyer and three passengers in his vehicle, Caleb, Timothy and Ethan Sawyer were taken to Blue Hill Memorial Hospital for treatment.
The cause of the accident is under investigation. Anyone with additional information about this accident should contact Peter Thompson & Associates, 1-800-804-2004.