She died of ovarian cancer.
She was diagnosed in early 2006 and had surgery and numerous treatments. She fought bravely, with class and never gave up. She was a proud lady who I was proud and happy to call my friend.
Here was her obituary:
ROBERTSON--Heather Merriweather, 38, died this past weekend in Buenas Aires, Argentina. Heather, a screenwriter, director and filmmaker, was the daughter of actors Dina Merrill and Cliff Robertson. She is survived by her brother Stanley H. Rumbough and her sisters Nina Rumbough of Greenwich, Connecticut and Stephanie Saunders of Charlesston, South Carolina. Family services will be held privately. Friends may send memorial contributions in Heather's name to St. Paul's School, 325 Pleasant Street, Concord, NH 03301-2591
Muriel Robertson FRS died in 1973.
Lucille Dixon Robertson died in 2004.
Albert Robertson died on 1952-01-03.
Cliff May died in 1989.
Lexie Dean Robertson died on 1954-02-16.
Yes, Cliff Robertson died on September 10, 2011
No, Heather doesn't die.
he did not die
Jason Robertson died in 2003.
Fred Robertson died in 1997.
Ted Robertson died in 1991.
Jimmie Robertson died in 1950.
Stuart A. Robertson died in 2005.
Jocky Robertson died in 2004.
Lewis Robertson died in 1914.
Thomas A. Robertson died in 1892.
Irvine Robertson died in 1956.