Isaäc Troostwijk was lieutenant-colonel of the Royal Dutch-Indian Army (Koninklijk Nederlands-Indisch Leger - K.N.I.L.). He died on 28 November 1942 at the age of 62 in camp Westerbork.
Jewish Historical Museum, Documents collection, inv.nr 3397
Amsterdam municipal archive, Records Jokos, Möbel-claim 15349, property Joods Maatschappelijk Werk;
He was buried in the Jewish cemetery in Assen on 1 December 1942.
Death register of the Jewish community Assen