About Otto Mahler
Born the 10th of 11 sons, and 12th as to birth order among the 14 Mahler siblings, Otto Mahler died of a self-inflicted gunshot wound to the head. His suicide occurred during his stay at the Vienna residence of close and long-time Mahler family friend, Nina Hoffman.
While his brother, Gustav had sent him to the Vienna Conservatory to be formally trained in music, in the same tradition as his older brother had before him enjoyed, Otto secretly left the Conservatory without a diploma, and found it impossible to stick to either of the several posts his brother, Gustav negotiated for him.
A melancholy young man of 21, Gustav Mahler referred to his young brother as 'gifted', even believing the boy to be more talented than he, himself. Otto, however, found it impossible to apply himself, professionally; thus, he left a letter of farewell for his brother, essentially saying that he was so unhappy with his life that he elected to return my ticket and move on. His extremely private guardian and elder brother carried Otto's memory in his heart; albeit, he grieved in silence. He rarely spoke of Otto, again, and aside from the deeply mourned loss of his first brother and crib-mate, Ernst, who died at age 13 (when Gustav was 14), Mahler was closer to Otto than to either of his other 9 brothers.