It was an all-girls cruise vacation aboard the Carnival Liberty when disaster struck. Samantha Broberg, 33, climbed a rail on a 10th-floor deck around 2 a.m. while the ship was sailing in the Gulf of Mexico. The ship's thermal imaging camera captured the moment when she suddenly fell backwards and plunged into the water. Her body was never found. Back home in Arlington, Texas, Broberg’s daughters still fight back tears remembering their mom, more than two years after the accident.