In his size -- he was 6-foot-7 -- and his centeredness, James Arness suggested John Wayne, to whose production company he was under contract before he became the star of “Gunsmoke.” For 20 years, from 1955 to 1975, Arness, who died Friday at the age of 88, played Marshal Matt Dillon in what, along with “Law & Order,” is the longest-lived drama on American television. READ ENTIRE L.A. TIMES OBIT