And her family launched a tireless crusade to keep it from happening again.

Edie Magnus has the story of a "Deadly Encounter."

Read a preview blog entry from producer Lee Kamlet:

"In 1997, Kendra left her hometown in upstate to move to New York City. She worked at a recording studio, and loved to spend time sitting outside, just watching people. Her warmth comes through in the many pictures and home videos her family shared with us. Her family said Kendra would never turn away from a stranger. That proved to be true, in the most tragic of ways. On a damp, dreary day in January 1999, Kendra crossed paths with another New Yorker, a stranger named Andrew Goldstein. Kendra had made a last-minute decision to defy the rain, and take the subway to meet some friends. Andrew was going to take the same train home. Witnesses say Andrew stepped up to Kendra and asked the time. Then, just as the train pulled into the station, he stood behind Kendra, and with what one person called impeccable timing, shoved Kendra in front of the train. She died on the tracks. The horrific story stunned not only New Yorkers, but the entire nation. What could have prompted someone to push a total stranger in front of the fast-moving train? To find the answer, Dateline spent 10 months investigating the story. We learned that Andrew Goldstein had quite a history." Click here to read more