That's not because the two shootings are directly connected but rather because the Wisconsin attack was influenced by the Columbine attack. And the CEO killing has many of the same hallmarks that could lead to it influencing future attacks as well. To examine how likely that is, we have former FBI agent and active shooter research pioneer Katherine Schweit back on the show.

Schweit was part of the team that began tracking active shooter events in the wake of the Sandy Hook attack. She helped create the framework for responding to them for both law enforcement and civilians. She agreed there is reason to think the CEO killing could have a similar effect to that of Columbine.

She said it's hard to know what might happen with future assassination attempts, but the messaging and viral nature of the CEO killing make copycats more likely. But she said she has seen progress in combatting active shooter incidents, with the number falling the past two years. And the same tactics could be used to reduce copycats as well.

Special Guest: Katherine Schweit.