Jacob de Vries was deported via Westerbork to Bergen-Belsen in the autumn of 1944. He witnessed the liberation of the camp and returned to his hometown of Leeuwarden, where he was committed to hospital. He died on September 1st, 1945, due to the effects of his stay in the camps. Jacob de Vries was buried in the Jewish cemetery of Leeuwarden, next to the memorial stone commemorating his parents, brother and sister.
B, Boersma, De firma I.B. de Vries. Een joodse antiekhandel in Leeuwarden van 1877 tot 1941 (Leeuwarden, 2003)
The obituary for Jacob de Vries has been published in M.H. Gans, Memorboek. Platenatlas van het leven der Joden in Nederland van de Middeleeuwen tot 1940 (Baarn, 1971)
It is uncertain whether Jacob lived at his parents' address at the time of deportation.