Rosenda Monteros, a Mexican actress remembered for her turn as one of the few women in John Sturges’s classic western “The Magnificent Seven,” died on Dec. 29 at her home in Mexico.

A spokeswoman for her family, who is also a representative for the National Theater Company of Mexico, said the cause was pelvic cancer. The spokeswoman said Ms. Monteros was 86, although according to Spanish-language news media accounts and other sources she was 83.

Ms. Monteros, a successful actress in Mexican theater, films and television for more than five decades, played a small but important part in “The Magnificent Seven,” the 1960 remake of Akira Kurosawa’s 1954 film “Seven Samurai.” In the Hollywood version, seven gunslingers are hired by local farmers to defend their Mexican village from bandits.

The movie had an all-star cast, with Yul Brynner, Steve McQueen, Charles Bronson, Horst Buchholz, Robert Vaughn, Brad Dexter and James Coburn as the seven gunmen and Eli Wallach as the leader of the bandits. The film featured a stirring and now instantly recognizable theme, composed by Elmer Bernstein.