How did Edvard Munch's brother die?

Edvard Munch had three sisters and a brother. His older sister by one year, Sophie, died at the age of 15 of tuberculosis. Laura, who was four year younger than Edvard, suffered from mental illness but died of cancer in 1926. His youngest sister, Inger, lived to a ripe old age. His younger brother, Andreas, died of pneumonia at age 30 shortly after getting married.