Career
Muñoz Rivera entered public life as San Juan Mayor Felisa Rincón"s right-hand man, serving as her Special Assistant, Auditor and Budget Director for the City of San Juan. Elected on the Popular Democratic Party of Puerto Rico slate of delegates to Puerto Rico"s Constitutional Convention, he participated actively in the drafting of the Constitution of the Commonwealth of Puerto Rico between 1951 and 1952. Subsequently, as an attorney, he was looked upon as an important source of guidance for constitutional interpretation.
The Governor, Senate President Kenneth McClintock and House Speaker José Aponte authorized a state funeral upon his death in 2006, the highest honor that Puerto Rico bestows upon its most notable citizens.