Brutal: Eight-year-old boy beaten to death with a rock trying to protect his sister, 12, from teenage rapist

A community in Richmond, Virginia, is reeling after an eight-year-old boy was beaten to death while trying to protect his 12-year-old sister from a rapist.

The boy, identified as Martin Cobb (pictured at left), was pronounced dead at the scene in the 200 block of Brandon Road Thursday night.

His sibling, whose name is not being released because of her age and the nature of the crime, was taken to a hospital.

Police have since apprehended the suspect, who turned out to be a black teenager.