"A tragedy had been quietly enacted here over the last few months. Because of the defamation in Germany [in 1937 a total of 639 works by Kirchner were confiscated by the Nazi-regime: Degenerate Art] and the failure of the November exhibition in Basle.. ..he [=Kirchner] chose a radiantly beautiful day, 15 June, to put an end to his life. I shall spare you the details. He had been suffering grievously until he was able to make this decision."
January 1, 1970
https://en.wikiquote.org/wiki/Ernst_Ludwig_Kirchner