 Investigators say they have not yet uncovered a motive and so far believe Crooks acted alone. He was a registered Republican and did make a $15 donation to a progressive organization in 2021, according to the Federal Election Commission. Crooks worked at a nursing center and was a member of a local gun club. Crooks was shot to death by Secret Service agents. Both Republicans and Democrats in Congress say they'll investigate security failures at the rally. Former Secret Service Deputy Director A.T. Smith.