I was watching an old episode of CSI and i could have sworn I saw Kellan Lutz as one of the suspects atau something. ANyone know if that was really him? Cuz I wasn't sure

If anda check on imdb.com anda can find all the work he's done. And it does tunjuk him as a character in one episode, although I'm not sure if he's the same one as you've seen.

He plays in CSI and CSI Ny!

Yeap! That's him alright!

Check here link

Acted as Alex Hopper in 1 episode apparently.