Ronald Anthony Burgos Aviles, 28, was being held without bond in the Webb County jail on two counts of capital murder
Grizelda Hernandez, 27, and her son, Dominick Alexander Hernandez, were killed Monday near Macnaboe Park, south of the World Trade Bridge at the border
Burgos Aviles and the woman were in a romantic relationship. The investigation will determine if Dominick was Burgos Aviles' child.
Burgos Aviles was a nine-year veteran of the Border Patrol, and had been promoted last year.