A 20-year-old man with a history of mental illness threw his 4-year-old brother off their apartment building roof Saturday in Brooklyn, police said.

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Shawn Smith flagged down officers and directed them to his brother's body around 3:30 a.m., the New York Daily News reported.

Officers found Shimron Smith lying unconscious in the courtyard of the apartment building. He was pronounced dead at the scene.

Shawn Smith, who has a history of schizophrenia, was arrested and charged with murder after throwing his brother from the roof of the seven-story building, the New York Daily News reported.

The Associated Press contributed to this report.