On the evening of September 10, 2001, 31-year-old physician Sneha Philip walked into her Lower Manhattan apartment building carrying shopping bags. It was the last confirmed sighting of her. By the next morning, planes struck the World Trade Center just blocks away, plunging the city into chaos and swallowing the mystery of her disappearance into the tragedy of 9/11.

In September 2015, 35-year-old Kelley Clayton was brutally beaten to death in her Caton, New York home. While her husband, former hockey pro Thomas Clayton, claimed to have a solid poker-night alibi, their seven-year-old daughter's description of the masked killer pointed directly to a sinister murder-for-hire plot. This week we cover the tragic murder of Kelley Clayton and the ultimate betrayal of a husband's greed.