HELENA, Mont. — Hugh Ambrose, who wrote the World War II history “The Pacific” after years of researching for his father, the renowned historian Stephen Ambrose, has died at age 48.

Ambrose died of cancer Saturday in Helena, sister Stephenie Ambrose Tubbs said Tuesday.

Hugh Ambrose began research for “The Pacific” with his father, and he carried on after Stephen Ambrose’s death in 2002.