Nick Mavar suffered a medical emergency in Alaska
                                
                                
                                    (Newser) -
                                    A skilled deckhand on Deadliest Catch,  known as  his captain's "go-to guy" has died.  TMZ  reports that Nick Mavar, 59, who once toiled on the commercial fishing vessel F/V Northwestern on the Discovery Channel reality show, died Thursday in the Alaskan city of Naknek, according to a rep...