Nakdimon and Mayzlish were able to trace the assassin, Avraham Tehomi (1903–1990), then a businessman living in Hong Kong. Tehomi was interviewed for Israeli TV by Nakdimon and openly stated: "I have done what the Haganah decided had to be done. And nothing was done without the order of Yitzhak Ben-Zvi (who later became the second president of Israel 1952-1963)... I have no regrets because he (de Haan) wanted to destroy our whole idea of Zionism" (Nakdimon). Tehomi denied allegations that De Haan's assassination was related to his homosexuality: "I neither heard nor knew about this", adding "why is it someone's business what he does at his home?" According to Gert Hekma, Zionists spread a rumour he had been killed by Arabs because of his sexual relations with Arab boys.
from wikipedia