Unknown documentary...
 

One of my co-workers was telling me about this documentary where a man goes into this "haunted house" where mysterious activities were happening. Such as people dissapearing, or having cuts or bruises when they left and so on.

So this man goes into the house and records him living there. He dissapears for a couple of days and they find him dead inside the house. Investigators searched the house with FBI agents and forensic scientists....they couldn't figure out who or what killed him.

Has anyone heard of this or knows what this documentary is?

Doesn't ring a bell, but sounds really interesting. But at the same time, it gived me the Blair Witch feeling.... so I dunno...

kinda reminds me of this documentary i saw, which seemed really convincing right up until the end, and then it got ridiculously bad

Ace, are you talking about The Last Broadcast?

http://imdb.com/title/tt0122143/

I don't wanna spoil anything, but I think this might be what you're talking about.

no thats not it... it was about a bunch of people who tried to spend the night in a haunted house and all the weird shit that happened

it was awesome right till like 10 minutes left... then it crashed and burned hard