A 5-year-old boy in Elmo, Missouri, accidentally shot and killed his 9-month-old brother Monday, WDAF-TV reports.

Police said the boys' mother, Alexis Wiederholt, called 911 Monday morning and told dispatchers that the older boy had shot the baby with a paintball gun. However, officers said the infant had actually been shot with a .22-caliber Magnum revolver. The baby was taken to the hospital and pronounced dead.

The loaded gun had been stored on a shelf in the headboard of Wiederholt's bed, according to Nodaway County Sheriff Darren White.

Neighbor Kathy Armentrout said four boys, including the baby and 5-year-old, live in the home.

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Helen Gilbert places flowers on her brother Eurie Martin’s grave at Camp Spring Baptist Church in Sandersville. Her brother died eight years ago. Three former Washington County deputies are accused of causing his death and are set to stand trial Monday. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez