Police continue investigating what caused a Brooks woman to cross the centerline on Route 1A and strike an oncoming vehicle.

Teresa Sirois was driving on Route 1A at 4:45 p.m. Feb. 21 when her vehicle traveled into the other lane and collided with a car driven by Randall Pukay, 53, of Bucksport, according to a news release from Department of Public Safety spokesman Steve McCausland.

Sirois died at the scene, police said, while her 3-year-old son was taken to Eastern Maine Medical Center to be treated for non-life-threatening injuries.

Pukay was also taken to EMMC for injuries he suffered in the crash.

Emergency personnel worked at the scene for nearly four hours, police said.

McCausland said Feb. 28 that investigators are aware Sirois was involved in another fatal crash in Searsport in August 2016. That crash claimed the life of a 62-year-old Gouldsboro man and Sirois suffered injuries as well. Searsport Police Chief Dick LaHaye on Feb. 28 said police believe Sirois also crossed the centerline in that crash, though what caused her to do so remains unclear.

Troopers are now trying to determine why Sirois' vehicle crossed the centerline in the Frankfort crash.