Estrada, a community leader and local broadcaster, was killed in the early morning of July 16 in the municipality of San Pablo, located in Bolívar Department.
Unidentified attackers shot the journalist as he was returning home with his wife after attending a family reunion.
Estrada was the president of the Asociación para el Desarrollo de la Comunicación y la Cultura de San Pablo, a community organization affiliated to a network of community radio stations. At the time of his death, the journalist was working to launch a community station for San Pablo.
Investigations have not revealed the identity of the attackers or the possible motive.