 The NFL's Minnesota Vikings said that their rookie quarterback, Kyrie Jackson, was killed in an overnight car accident that left two others dead in Maryland. Jackson was a fourth-round selection in the NFL draft after playing collegiately at Oregon and Alabama. This summer, he'd expected to set records, and experts are reminding parents about steps they can take to keep their kids safe. That includes hydration, and ABC medical correspondent Dr. Darian Sutton says that means avoiding hot car deaths.