Vachik Mangassarian, known for his roles in 'NCIS: Los Angeles' and 'Marvel's Agents of S.H.I.E.L.D.', has passed away at the age of 78. His representatives at McCaffrey Talent Management told Deadline that he died of complications from COVID-19. Vachik also appeared in the shows 'Intelligence', 'The Mentalist' and 'NYPD Blue'.