Collier died on April 23, 1909. His will left most of his estate to his wife and son. His estate included shares in the Rumson Polo Club, Monmouth Agricultural Fair Association, co-ownership of Colliers Weekly, shares in the Meadow Yacht Club, shares in the Kentucky Horse Show Company, Tammany Publishing Company and a life insurance policy. All his assets were liquidated and amounted to $2,890,440 (approximately $ today). His wife received a life estate and an annuity of $33,044. His son received $2,280,410 and the rest was distributed to various organizations.