Carlos Rivas born Oscar Weber was an American actor best remembered as Lun Tha in The King and I 1956 Dirty Bob in True Grit 1969 and Hernandez in Topaz 1969 Carlos Rivas was discovered in a bar in Mexico He began his career in Mexican and Argentinian westerns though his Argentinian films were actually filmed in Mexico His American debut was in The King and I 1956 opposite Rita Moreno After this career highlight he was quickly reduced to supporting roles That same year of 1956 he appeared as Johnny Bravo in the TV western Cheyenne in the episode titled Johnny Bravo Rivas had costarring roles in two science fiction films The Beast of Hollow Mountain 1956 and The Black Scorpion 1957 Rivas played Chingachgook in The Deerslayer 1957 with Lex Barker Forrest Tucker and Rita Moreno In 1970 Rivas joined Ricardo Montalban Henry Darrow and other Latino actors in cofounding the Nosotros We Foundation a Los Angeles based organization devoted to improving the way Hispanics are depicted in entertainment and advocating for Latinos in the movie and television industry