Been scraping my mind for the name of a sci fi horror film I watched on the scifi channel sometime between 2000 and 2004.

What I remember:
>Takes place completely on a spaceship/station
>Crew members become paranoid and start killing each other, committing suicide, etc...
>There's a scene with a dead crew member floating outside the ship with something around his neck
>The cause of all the insanity is some alien entity aboard the ship
>I vaguely remember the main character(s) sealing an airlock door and I believe the movie ends in a cargo bay

That's all I got... it's very (even suspiciously) similar to Even Horizon and maybe Solaris with some hints from other sci fi horrors like Aliens and such.

Thanks for any help