In 1907, he became acquainted with Sofija Kymantaitė (1886–1958), an art critic. Through this association Čiurlionis learned to speak better Lithuanian. Early in 1909, he married Kymantaitė. At the end of that year, he traveled to St. Petersburg, where he exhibited some of his paintings. On Christmas Eve, Čiurlionis fell into a profound depression and at the beginning of 1910 was hospitalized in a psychiatric hospital "Czerwony Dwór" (Red Manor) in Marki, Poland, northeast of Warsaw. While a patient there, he died of pneumonia in 1911 at 35 years of age. He was buried at the Rasos Cemetery in Vilnius. He never saw his daughter Danutė (1910–1995).