Law enforcement authorities in the United States and Mexico on Tuesday confirmed the slaying of the high-ranking Mexican state police commander who was overseeing an investigation into the fatal shooting by suspected pirates of an American tourist on a Texas border lake.

Prosecutors in the Mexican state of Tamaulipas, which runs along the Texas border from Brownsville to Laredo, identified the dead commander as Rolando Flores, who headed state investigators in the border city of Ciudad Miguel Aleman.

Spokesman Ruben Rios said authorities "don't know how or why he was killed, but confirmed that Commander Flores unfortunately