Nick Mavar — a popular deckhand for Sig Hansen’s F/V Northwestern on Deadliest Catch — died after a medical emergency on Thursday (June 13). Mavar was featured in nearly 100 episodes of the Discovery Channel show, suffering multiple injuries and at one point suing the boat’s owners after a medical emergency was caught on camera. TMZ broke the news of Mavar’s death, citing Bristol Bay Borough (Alaska) PD.No cause of death was given.He left the show in 2021.Related: Duck Dynasty Cast Update: Where Every Robertson Is Today Season 20 of Deadliest Catch began this week. The show, narrated by Mike R…