The work took a terrible toll on his constitution, however, and he died at Llanwern on the morning of Wednesday, 3 July 1918, aged 62. He was cremated at Golders Green, but his ashes were returned to Llanwern, where they lie alongside the bodies of previous squires of Llanwern (although D. A. Thomas' monument is by far the largest – "on a recent visit to Llanwern, it took me two circuits of the churchyard to find the tomb, since I had initially mistaken it for the War memorial", in the words of one D. A. Thomas Scholar), his wife and daughter. His epitaph reads, 'He counted his life not dear to himself.'