. >> reporter: reid switeman wrote the shocking "new york" magazine article detailing their ordeal.firsthand. the letters recreated in "the watcher" with naomi watts and bobby canavale. >> i am pleased to know your names and the names of the young blood you've brought me. >> reporter: it incorporates westfield's notorious list family murders and has become a massive hit, 125 million hours streamed and counting, according to "deadline." despite a police investigation, private investigators, and forensic analysts looking into the case, the watcher was never identified. >> i felt very bad for derek and maria. i felt they were very troubled, which i would be too if i received those at my new home. >> such efforts have not, however -- >> reporter: andy skabitsky was the mayor at the time. >> it was reported they didn't do enough, but trust me, the westfield police department is very professional, unlike depicted in the series. >> i think they did all they could with the informtion they had. they did dna samples on the few letters. there were only four letters total. so they didn't have a