The four died instantly in the two-vehicle crash about 1:30 p.m. Sunday. The accident occurred on Route 3 in Palermo.
The victims have been identified as 18-year-old Tyler Manduca and his brother, 21-year-old Kyle Manduca, both of Bucksport, and 64-year-old Dennis Sturges and his father, 83-year-old Roy Lucier, both of Palermo.
Troopers say light snow was falling at the time of the crash and Tyler Manduca was traveling too fast when he lost control of his sport-utility vehicle. It skidded sideways into Sturges' car. They say alcohol is not considered to be a factor.
The road was closed for nearly four hours.