Did William Andrew clark jr have children?

From the Montana Historical Society Research Center:

In 1901 William Jr. married Mabel Duffield Foster of Butte. She died in 1902 after giving birth to William's only child, William Andrews Clark, III. That son died in 1932 in an airplane crash. William Jr. married again in 1907 to Alice McManus Medin. They did not have any children.