Tough one Kevin. I'm having trouble determining the structures symmetry (if it has any at all), exacerbated by focus/resolution problems. If it is a hook then it is almost certainly incomplete (no prize there). Whoever collected/photographed it (?Mike Everhart) must recollect and look for further material, hopefully series of them, hopefully some of which will be more complete (and more revealing).
I know of one squid type only (extant squid) that has a single hook on an arm (two hooks in total on the intact animal; all other suckers carry conventional sucker rings) .... tiz a 'secret squid' .... All other squid that possess hooks, with which I am familiar, possess many of them, in two rows, either along the arms or arming the tentacle clubs (this is not to say the fossil 'cephalopod' shared the same body plan). Nevertheless, if this structure was a hook, or part of a hook, then more than likely there'll be many more of them locked in that matrix.
Verdict .... unknown - UFO (unidentified fishy object)