|Call of Pripyat|
He can be identified from a distance by the exoskeleton suit he wears along with his TRs 301 rifle with a silencer and scope attachments. His PDA mentions that the group is awaiting news of a deal going down before they proceed towards Jupiter.
In Clear Sky, there is a stash in the swamps that mentions Hook. It is possible that Hook was in an operation in the swamps during the events of Clear Sky or simply that it is another character that shares the same name.