"Boys came and knocked on my door and said the police just shot your son" – Samaria Rice

As part of an exclusive interview featuring four mothers mourning lost sons, on Friday Samaria Rice recounted the way in which she learned of her child's death.

"Two more boys came and knocked on my door and said the police just shot your son twice in the stomach," she told Anderson Cooper. "I was still in disbelief until I actually seen my son laying on the ground. And the police was surrounding him."

On Friday, 12-year-old Tamir Rice's death was ruled a homicide.

Watch the above clip, as Samaria Rice explains why she feels video from that day, and audio of Tamir's screaming sister, needs to be seen and heard by the world.