Carlos Rivas was born in 1928 in Texas.   His best known role was as Lun Tha in “The King and I” in 1956.   He was also featured in “Comanche”, “The Deerslayer”, “The Miracle”.   He died in 2003 at the age of 74

“Wikipedia” entry:

Carlos Rivas  was an American actor, best remembered as Lun Tha inThe King and I (1956), Dirty Bob in True Grit (1969), and Hernandez in Topaz (1969). Rivas was born in El Paso, Texas, to a German father and Mexican mother. English was his first language.    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.^[2] Rivas had co  – starring 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 1969, Rivas co-founded, with Ricardo Montalban and Henry Darrow, Nostroso, a Los Angeles based organization devoted to improving the way Hispanics are depicted in entertainmsent.