The teen twins accused of killing their mother earlier this year have been moved to the Rockdale County jail upon turning 17 - the age they can be considered an adult in Georgia's legal system. Jasmiyah and Tasmiyah Whitehead were 16-years-old in January when they allegedly beat and stabbed their mother, Jarmecca "Nikki" Whitehead, 34, to death at their home in the gated Bridle Ridge subdivision off of Dogwood Drive. The girls were already being charged as adults, but were reportedly kept at youth detention facilties after they were arrested in May.