Miami-Dade County Commissioner Jose "Pepe" Diaz is under investigation by county and federal authorities for possible criminal and ethics violations stemming from his support for a development project in west Miami-Dade. Officials say they are focusing on a fishing trip to Cancun, Mexico, paid for by prominent Miami developer and Republican fund-raiser Sergio Pino, who benefited from Diaz's support for a controversial zoning change. Both deny any wrongdoing.