RICHMOND, Va. -

An 8-year-old Virginia boy died while trying to save his 12-year-old sister from being sexually assaulted, family members said.

The children's stepfather and aunt told ABC-affiliate WRIC the kids were in their backyard near some railroad tracks on Brandon Road in Richmond Thursday evening. That was when a man walking along the tracks sexually assaulted the 12-year-old girl and cut her face, said family.

The girl's 8-year-old brother tried to intervene, but the man threw a rock at his head, killing him instantly, according to the family.

Richmond Police told WRIC a teen male connected with Thursday night's homicide has been found and is being medically evaluated. Warrants have been obtained for his arrest.

WRIC reports that the 12-year-old girl is recovering at a hospital. Her 8-year-old brother who died was a student at Redd Elementary School.

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For more information, visit WRIC.