Zoe's step-brother, Lucas, had written a script for a movie/play where he revealed that his father abused his mother before she died. Right before the concert, Lucas had emailed the script to Maria and Zoe as a warning that his father was dangerous. Maria had kept Zoe's criminal past from Chris and he found out about it the night she died. It was Lucas who accidentally pushed Maria down the stairs, but he recorded everything on his cell phone. Zoe convinced him to turn the video in and say that Chris was the murderer. It worked. The cops arrested Chris.
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