A woman who was hit by a train and killed in Summerville today committed suicide, Dorchester County Chris Nisbet said.

He identified her as Joyce Lillian Brook, 54, of Duggins Lane in Summerville.

A train heading toward Charleston hit her about 12:40 p.m. on the tracks near Cypress Street and Doty Avenue.

An autopsy will be performed Wednesday, but it appears the woman lay down on the tracks and stayed there until a train hit her, killing her instantly, Nesbit said.