Yes, see this link_
George Peppard led a troubled life, he was an alcoholic for almost 30 years (he started drinking after his father died in 1951 and finally quit in 1978 and in many ways he had a self-destuctive personality: the many wives, the drinking, the smoking).
Unfortunately this all caught up with him in later life. He never really got the big part that he truly deserved - he almost made it in Breakfast in Tiffany's but he played second fiddle to Audrey Hepburn's 'Holly Go Likely'.
George (a lifetime smoker) died of pneumonia, a result of his weakness from chemotherapy sessions to treat cancer.
George Peppard's grave in his hometown of Detroit: