The operator "lost her life due to the failure of the responsible parties to inspect these tracks and keep them clear," said the attorney for the family.

The River LINE operator who died in a crash Monday was a 41-year-old single mother of three, according to an attorney preparing to sue NJ Transit on her family's behalf. And the cause of the fatal accident — a fallen tree on the tracks — was a known hazard in the crash area, the lawyer says.

Family of Jessica Haley, a River LINE operator from Bucks County killed Monday morning, plans to sue over deadly crash