Police said the Thursday death of a Lincoln woman along Interstate 95 is an apparent suicide.

Heidi McGovern, 26, of Lee stepped in front of a tanker truck, holding her 2-year-old son, Enoch, according to police.

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

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

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

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