State Police are investigating the death of a woman along Interstate 95 north of Lincoln Thursday afternoon as an apparent suicide.

Troopers said 26-year-old Heidi McGovern of Lee stepped in front of a tanker truck, holding her two-year-old son, Enoch. McGovern was killed instantly and her son was thrown from her arms, away from the truck, and landed in the passing lane of the highway.

The boy remains hospitalized at Eastern Maine Medical Center in Bangor with serious injuries. Troopers said McGovern had left suicide notes behind at her home.

The tanker truck is owned by Irving Oil and was driven by 59 year old Kenneth Gray of Bucksport. The Irving truck was hauling fuel.

The crash took place about 4:30 in Township 2 - Range 8, which is about four miles north of the Lincoln exit.

McGovern was also the mother of an infant, who was elsewhere at the time of the incident.