Zack Sharf Digital News Director Melissa Joan Hart, the actor who became a ’90s teen icon thanks to her roles on Nickelodeon’s “Clarissa Explains It All” and ABC’s “Sabrina the Teenage Witch,” revealed in an emotional Instagram video that she helped young children and teachers escape the Nashville school shooting on March 27. Three adults and three 9-year-old children were killed by a 28-year-old woman at Nashville’s Covenant School. The shooter was shot and killed by police on site. “My kids go to school right next to a school where there was a shooting today,” Hart said in the Instagram video. “My husband and I were on our way to [their] school for conferences. Luckily our kids weren’t in today.”