Watch Murder at First Swipe for Free: How to Stream the Movie Online at 123Movies. . Serial killer Stephen Port scoured dating apps to choose and target his victims. He then drugged, raped and murdered them, before discarding their lifeless bodies on the streets of East London. Featuring exclusive interviews from those closest to the case, and unseen correspondence from Port himself, this new feature documentary explores the web of lies spread by a killer hiding in plain sight.