Allen's story is on Main Street Mysteries - Investigation Discovery
~Spoilers~
I am watching Main Street Mysteries on The Investigation Discovery Channel.
http://investigation.discovery.com/videos/main-street-mysteries/
Main Street Mysteries
Season 2 Episode 7
First Aired: November 12, 2010
Description: Filmmaker Allen Ross goes missing without a trace. When his friends and fellow filmmakers search for any information, they discover that Allen's relationship with a strange cult leader had ultimately lead to his murder.
They will be airing it off and on the next couple of weeks or more:
http://investigation.discovery.com/tv-schedules/series.html?paid=141.15376.130351.41043.x
You should be able to watch it online too at the above site or by searching the following term:
main street mysteries full episodes - fade to murder
~ "The greatest trick the Devil ever pulled was convincing the world he didn't exist."