NEW YORK (AP) -- Nick Ashford, one-half of the legendary Motown songwriting duo Ashford & Simpson that penned elegant, soulful classics for the likes of Diana Ross and Marvin Gaye and funk hits for Chaka Khan and others, died Monday at age 70, his former publicist said. Ashford, who along with wife Valerie Simpson wrote some of Motown's biggest hits, died in a New York City hospital, said Liz Rosenberg, who also was Ashford's longtime friend.