Walt Martin

Walt Martin (April 8, 1945 – July 24, 2014) was an American production sound mixer. He was nominated for Academy Awards in the category Best Sound Mixing for the 2006 movie "Flags of Our Fathers" and the 2014 movie "American Sniper". He worked on more than 70 movies. 
He died of vasculitis on July 24, 2014 in Burbank, California, aged 69.