From Muppet Wiki

Jaime Sánchez (b. 1938) played Miguel in the second season of Sesame Street. Sánchez was the first Latino cast member on the show. He left the show after one season, and in Season 3, three more Latino cast members were added -- Sonia Manzano, Emilio Delgado and Raúl Juliá.

Sánchez has also appeared in Bonanza, Miami Vice and Law & Order. He recently appeared in the 2005 film Carlito's Way: Rise to Power.