Three children and three adults were killed after a shooter opened fire at a private Christian grade school in Nashville, Tennessee. John Drake, Nashville's police chief, joins "CBS Mornings" to discuss the police response and the latest on the investigation.Forensic psychologist Jillian Peterson has spent years researching mass shootings and was president of The Violence Project. She joins "CBS Mornings" to discuss what we can learn from the Nashville shooting, and strategies that could help prevent future mass shootings.Kyra Sedgwick joins "CBS Mornings" to discuss her feature film directorial debut, "Space Oddity," which features her husband, Kevin Bacon.For our More Perfect Union series, CBS News' Elaine Quijano reports on the bond between a 15-year-old girl living with the muscular disorder cerebral palsy and a fitness coach teaching her that her diagnosis doesn't have to slow her down.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.