Long Island serial killer suspect Rex Heuermann allegedly contacted sex workers hundreds of times and watched videos of the killings of women online before he was arrested in connection to the Gilgo Beach murders. In a new court filing obtained by ABC New York, prosecutors claimed that Heuermann, 62, registered burner phones and a Tinder account in order to communicate with sex workers. He created the accounts under the aliases of "Andrew Roberts" and "Thomas Hawk" in an attempt to hide his identity.