He became 6th Baron Plunket of Newtown on the death of his father on 24 January 1920. On 4 December 1922, he married Dorothé Mabel Barnato (née Lewis), widow of Captain Jack Barnato and the illegitimate daughter of actress Fannie Ward and Charles Vane-Tempest-Stewart, 7th Marquess of Londonderry.
Royal Military College, Sandhurst.
The Plunkets died in 1938 in a plane crash in California. After planning a stay of several weeks in California, they had arrived in Hollywood around the 11th of February, 1938. They had rented the mansion of former screen comedian William Haines.
They were bound for the Hearst ranch at San Simeon, now known as Hearst Castle.
In the coastal fog surrounding the airstrip on the ranch, the pilot overshot the field by nearly a mile and a half. One wing struck the ground, causing the plane to burst into flames and crash.
James Lawrence was the only survivor, having been thrown clear of the plane. He suffered burns and a broken ankle.
Lord and Lady Plunket had three sons:
Patrick Terence William Spanish Plunket, 7th Baron Plunket of Newton b.
8 September 1923, daughter 1975
Captain Robin Rathmore Plunket, 8th Baron Plunket of Newton b. 3 December 1925
Honorary Shaun Albert Frederick Sheridan Plunket b.
5 April 1931, daughter 10 January 2012.
