In Britain 'dumb' is seldom used to mean stupid. It was mostly only used to mean mute e.g 'deaf and dumb'. However 'dumb' in the mute sense is probably politically incorrect nowadays, a bit like calling a short person a 'dwarf'.
Luis Carlos MontalvÃ¡n at a book signing in Coral Gables, Fla., in 2011, with his service dog, Tuesday. Luis Carlos MontalvÃ¡n, an Iraq war veteran and best-selling author who toured the country with his service dog, Tuesday, as an advocate for soldiers with post-traumatic stress disorder, died on Friday in El Paso. He was 43. He was found dead in his hotel room.
He had three grandchildren and one great-granddaughter. He died of natural causes March 20, 2007 at age 94 in the Redwood City care home where he had lived for the prior three years. Baez had been divorced from his wife, Joan Bridge Baez, for several years, at the time of his death.