U.S. playwright Neil Simon, who became one of Broadway's most prolific and popular playwrights as he combined humor, drama and introspection in works such as "The Odd Couple," "The Goodbye Girl" and "Lost in Yonkers," died on Sunday at the age of 91, the New York Times reported, citing his publicist. A new Simon play almost every theatrical season was a Broadway staple from 1960 through the mid-1990s, placing him in the ranks of America's top playwrights.