Police officers in the city of Louisiana, Missouri used the stun gun to stop Ryan Miller after he kicked in a front door and tried to enter his house to rescue his 3-year-old stepson, Riley.
Officers on the scene felt it was too dangerous to let anybody go in. Witnesses say Miller was tased three times, then handcuffed and thrown in the back of a police car.
The boy's body was eventually found 12 to 15 feet from the front door.
"How they all just stood around and waited for the fire department, what kind of police officer wouldn't try to save a 3-year-old burning in a house?" Emily Miller said.
Officials say a firefighter eventually tried to enter the home, but was forced back by the heat.