The reveal.

First viewing, I failed to remember him, but I did recognize the killer upon further viewings.

http://houstonrambler.blogspot.com/

No question that the director failed to properly portray that character. It resulted in a big WTF from me when I first saw it.

I read the script after seeing the film and no doubt the studio took the film and chopped it up. A great deal of important information ended up on the editing room floor.

This is a decent film that could have been something special.

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I can remember there was such a person in the film, but the script was very weak in failing to give proper development and significance to the character to make the final reveal credible.

There were so many red herrings in the film that almost everyone was a suspect - Sanderson himself, his old creepy mentor (what was the significance of his blindness?), his chess opponent Viktor Yurilivich, and most ridiculous of all - even the "bad cop" Wagner, who never believed one word said by Sanderson, but mysteriously showed up at the end to pick up the child to give the impression to the audience that he was about to harm her. Compared to all of them, the computer guy was a completely underwritten character and in fact very seldom seen. Even some guy in the psychiatric clinic or realty company, or even some random spectator would have made an equally (perhaps more) credible killer.