Photo: Hickenlooper Mass Shootings HV 4 20190416

Coni Sanders, left, and state Rep. Tom Sullivan speak during a gathering of 

families of victims of mass shootings on Tuesday at First Baptist Church in downtown Denver. The event was hosted by presidential candidate and former Colorado Gov. John Hickenlooper. Sanders is the daughter of Dave Sanders, the only teacher to be killed 20 years ago at Columbine High School. Sullivan's son Alex was killed in the Aurora theater shooting.