two tantalizing clues, a handprint. the subject had blood on their hand. and a trail on twitter. incredibly powerful. you can almost see this happening in realtime. could she help solve her own mystery? she s fighting him off. it was so emotional. i wanted to jump out of my seat. never in a million years would you expect something like that. on long island, about 10 miles down the shoreline from the mansions, the fancy cars and the elites of the hamptons, is a blue collar beach town some call the poor man s paradise. but life was rich for these brothers and sisters in mastic, new york, filled with the love of a large tight-knit family. all that was taken away one warm evening when evil rolled in with the summer tide. their youngest sister was missing. we just want you to come home safely. reporter: and for better or worse, this family would go to extraordinary lengths to find her. we re going to scour those woods right now. we were our own investigators.
the prosecutor says they knew if they could find a match, they could likely solve this crime. it s almost like it was the killer s calling card. it was his signature. the print specialist was able to compare that bloody signature with those of potential suspects detectives sent her way. you don t always know homicide s level of interest in somebody. you re going to compare these prints to anybody they ask. and one by one she checked for possible matches, helping police cross names of their list, like sarah s ex-boyfriend, d.j. his prints did not match. neither did brandon allen s. it was his house sarah had been at that night. he says once he was cleared, detectives started treating him differently. they just wanted to know what we knew. you could feel that. yeah. they re not really looking at me. they just want me to help. mm-hmm. and someone police had kept in jail for two days, the last known person to see sarah alive, jason flores was also cleared by his palm