Question: Who is currently in charge of the city where René Portocarrero died?

full_context: Document 1: Miami: In recent years the city government, under Mayor Manny Diaz, has taken an ambitious stance in support of bicycling in Miami for both recreation and commuting. Every month, the city hosts "Bike Miami", where major streets in Downtown and Brickell are closed to automobiles, but left open for pedestrians and bicyclists. The event began in November 2008, and has doubled in popularity from 1,500 participants to about 3,000 in the October 2009 Bike Miami. This is the longest-running such event in the US. In October 2009, the city also approved an extensive 20-year plan for bike routes and paths around the city. The city has begun construction of bike routes as of late 2009, and ordinances requiring bike parking in all future construction in the city became mandatory as of October 2009.
Document 2: René Portocarrero: René Portocarrero (born Havana, 24 February 1912; died Havana, 7 April 1985) was a Cuban artist recognised internationally for his achievements.
Document 3: Havana: The current mayor of Havana ("President of the People's Power Provincial Assembly") is Marta Hernández Romero, she was elected on March 5, 2011.
Document 4: Adriano Buergo: Adriano Buergo (born José Adriano Buergo y Ortiz March 5, 1964), is a Cuban artist specializing in painting, drawing and installations.
Document 5: Agustín Cárdenas: Agustín Cárdenas Alfonso (April 10, 1927, Matanzas, Cuba – February 9, 2001, Havana, Cuba) was a Cuban sculptor who was active in the Surrealist movement in Paris. His sculpture was influenced by Brâncuși, Henry Moore, and Jean Arp. Poet André Breton said of his artistic hand that it was "efficient as a dragonfly."
Document 6: Servando Cabrera Moreno: Servando Cabrera Moreno (1923–1981) was a Cuban painter. A supporter of the Cuban Revolution, many of his paintings depict the Cuban peasantry. Stylistically, his paintings are rooted in the tradition of vanguardia, and are especially indebted to the work of Carlos Enríquez Gómez.
Document 7: Ricardo Viera: Ricardo Viera (born in December 1945 in Ciego de Avila, Cuba) is a Cuban artist specializing painting, drawing, and engraving.
Document 8: Houston: The city of Houston has a strong mayoral form of municipal government. Houston is a home rule city and all municipal elections in the state of Texas are nonpartisan. The City's elected officials are the mayor, city controller and 16 members of the Houston City Council. The current mayor of Houston is Sylvester Turner, a Democrat elected on a nonpartisan ballot. Houston's mayor serves as the city's chief administrator, executive officer, and official representative, and is responsible for the general management of the city and for seeing that all laws and ordinances are enforced.
Document 9: Virgilio Piñera: Virgilio Piñera Llera (Cárdenas, Cuba, August 4, 1912 – Havana, October 18, 1979) was a Cuban author, playwright, poet, short-story writer, and essayist.
Document 10: Pedro Carrío: Pedro Carrió García (born 1970 in Havana) is a former international swimmer from Cuba, who participated in various international competitions for his native country, starting in 1982. He maintains the National Records in Cuban Swimming for Free Style 400 meters (1990), 1,500 meters (1991) and Free Style Relay 800 meters (1991).
Document 11: Mexico City: The first elected head of government was Cuauhtémoc Cárdenas. Cárdenas resigned in 1999 to run in the 2000 presidential elections and designated Rosario Robles to succeed him, who became the first woman (elected or otherwise) to govern Mexico City. In 2000 Andrés Manuel López Obrador was elected, and resigned in 2005 to run in the 2006 presidential elections, Alejandro Encinas being designated by the Legislative Assembly to finish the term. In 2006, Marcelo Ebrard was elected for the 2006–2012 period.
Document 12: Carmen Cardinali Paoa: Chilean deputy Interior Minister Rodrigo Ubilla appointed Carmen Cardinali as Governor of Easter Island in early September 2010 to replace Edmunds. Cardinali's challenges included archeological preservation of the island's heritage and revamping the tourist industry. She served as a Governor until March 2014, being replaced by Marta Raquel Hotus Tuki, appointed by president Michelle Bachelet.
Document 13: Marie Atkins: Marie Atkins was mayor of the Kingston and Saint Andrew Corporation (KSAC) from 1989 to 2003. Atkins was the third female mayor for Kingston & St. Andrew, Jamaica, and is the longest-serving mayor to date for Kingston & St. Andrew. She is the first Jamaican to become the president of the World Conference of Mayors.
Document 14: Fernando Velázquez Vigil: Fernando Velázquez Vigil (born Havana, Cuba; March 15, 1950 – died Havana; July 31, 2002) was a Cuban artist specialising in ceramics and painting.
Document 15: Cerro, Havana: Cerro is one of the 15 municipalities or boroughs ("municipios" in Spanish) in the city of Havana, Cuba. As of 2016 it is considered "one of Havana’s poorest municipalities."
ground_truth: Marta Hernández Romero
sub_queries: In what city did René Portocarrero die? Answer: Havana
Who was in charge of Havana ? Answer: Marta Hernández Romero