Vance Boelter, 57, impersonated a law enforcement officer when he carried out the violent rampage early Saturday, authorities said.

Boelter has been charged with stalking and murdering a Minnesota lawmaker and her husband, and shooting another lawmaker and his wife.

Boelter first reached out to Kalech's firm for a book he had written, "Revoformation," which Kalech took to be a mashup between "revolution" and "reformation." It's also the name of the ministry Boelter had once tried to get off the ground, according to the organization's tax forms.