Officials say the pilot survived the crash in south-western Texas and cause of crash is under investigationThree Texas Parks and Wildlife Department (TPWD) employees have been killed in a helicopter crash while conducting aerial surveys for desert bighorn sheep in the south-western part of the state, according to officials.The crash happened on Saturday in the remote wilderness of Black Gap Wildlife Management Area, which is adjacent to Big Bend National Park, on the Rio Grande that marks the border with Mexico.The victims of the crash were identified as wildlife biologist Dewey Stockbridge, fish and wildlife technician Brandon White, and state wildlife veterinarian Bob Dittmar, according to the TPWD.Officials said the pilot survived the crash and was taken to El Paso, the most westerly city in Texas, on the border with New Mexico, for further treatment, and the patient’s condition is currently not public.“No words can begin to express the depth of sadness we feel for the loss of our c...