Justin Ross Harris cleared of murder charge in son's hot car death.

The Cobb County District Attorney's Office has decided not to retry Ross Harris for murder in the hot car death of his 22-month-old son, Cooper. Harris was initially convicted but the Georgia Supreme Court overturned the conviction last year. The DA's office cited the lack of crucial motive evidence as the reason for not retrying Harris. Harris is still serving a 12-year sentence for exchanging graphic text messages with an underage girl. The DA's office has also decided not to try Harris on separate charges of possessing lewd photographs of two underage girls and sending nude photos of himself to those girls.