We finally learn what really happened the night Lila Stangard was murdered. Rebecca WAS on the roof, but when she got there, Lila was already dead. A short time before that, Sam had left Lila alive and well. Lila thought he was going to break things off with Annalise. In reality, he made a life-ending phone call. Soon after we learn the true identity of Lila?s killer: It was Frank! Watch this scene from the Season 1 Finale of How to Get Away with Murder, Episode 15: It's All My Fault.