Remembering Sam Shepard, playwright who gave voice to the drama of the heartland

Sam Shepard, long considered one of America's great playwrights of the modern era, offered a powerfully American voice in works that portrayed the darker side of American family life. He was also a renowned actor, earning an Oscar nomination. Jeffrey Brown looks back at his life and work with playwright and actor Tracy Letts after Shepard’s death at age 73.