Police: 2 Doctors, 2 Others Killed In Tulsa Mass Shooting; New Questions About Who Knew Uvalde Students Were Alive Inside Room; Zelenskyy: 20 Percent Of Ukraine Is Now Under Russian Control; Soon: Biden To Address Nation After Recent Mass Shootings; Biden Delivers Speech On Guns In Wake Of Mass Shootings; Biden Calls On Congress To Act On Gun Reform After Mass Shootings. Aired 7-8p ET

[19:00:29] ERIN BURNETT, CNN HOST: OUTFRONT next: A teacher's final moment. We're learning tonight of a call that a teacher who was killed in the Uvalde school massacre reportedly made [...]