An investigation is underway after an 87-year old man died four days after a house in Baltimore City. The man was injured during the house fire on Jan. 7 in the 1300 block of Lakeside Avenue, firefighters said. He died four days later. In a statement, the city fire department said the victim was found on the second floor of the two-story home. It's unknown what caused the fire. Investigators have not released the identity of the victim. The cause of death will be determined by the State Medical Examiner's Office. No further information was immediately provided.