The acclaimed songwriter, who teamed with wife Valerie Simpson to pen hits likeChaka Khan's 'I'm Every Woman' and 'Ain't No Mountain High Enough' -- a song made famous by soulful powerhouses Marvin Gaye, Tammi Terrell and Diana Ross -- was suffering from throat cancer and had undergone radiation treatment, according to longtime friend and former publicist Liz Rosenberg, who revealed the news to the Associated Press.
