ID this giant, evil crab

[likwid]

I have had my tank set up for almost 3 years now, and since day one there has been a hairy legged crab living in my live rock. After setting up a jar with an algae wafer inside of it, I finally caught him and he is massive!

His body is about 2 inches wide, with gray-ish with bright purple spots. He has light colored hairy legs and dark eyes/pinchers.

I have had several fish disappear without a trace in my tank, and I am wondering if he is the culprit. Anyways, check out the pics and let me know if you know what type of crab this is. I don't have a sump, so I will have to dispose of him some how if he is indeed evil.