Man o' War in his coffin. It was rumored that Man o’ War grieved himself to death. After groom Will Harbut’s death, the spark went out of the horse. He died just 4 weeks later on November 1, 1947 at the age of 30 of an apparent heart attack. He was the first horse to be embalmed, and his casket was lined in his riding colors. Man o’ War’s funeral was broadcast internationally over the radio and over 2,000 people came to pay their final respects. Thousands more sent their condolences.