Four years ago, two deaths sent shockwaves — and outrage — through the United States. On July 5, 2016, Alton Sterling was killed by police in Baton Rouge, Louisiana outside a store where he was selling CDs. One day later, on July 6, Philando Castile was shot and killed by police during a traffic stop in St. Paul, Minnesota while his girlfriend and young child were in the car. There were many similarities between the cases, aside from the dates of their occurrence. Namely, both men were legally carrying guns on them at the time of their deaths, though neither were brandishing their weapons or threatening police with them. And neither of their killers were held accountable.