A gunman wearing a clown costume has killed the oldest brother of one of Mexico's most notorious drug trafficking families in the resort of Los Cabos. Francisco Rafael Arellano Felix, 63, a former leader of the Tijuana Cartel, was shot in the head late on Friday at a family gathering in the southern tip of the state of Baja California Sur, state prosecutors said.'A person dressed as a clown took his life,' the spokesman said, adding that the gunman fled the scene. An unnamed official said the killer was wearing a wig and round red nose. The motive and the gunmen's disguise were being investigated. Local media reported that the killer had two accomplices when he attacked the former drug lord at a rented beach house, but this was not yet clear.