Well interestingly I could not find Kirk saying anything about Melissa Hortmans killing. That day is chock full of huge boner post for Israel Iranian War. When another shooting happened a day later he said (excerpt):

now today's diabolical attack in Minnesota, allegedly by Vance Luther Boelter.

There are far too many mentally unstable and suggestible people on the left …

With lots of decoration, projection and minimization around this tidbit. Full text

Edit: I'm aware Boelter turned out to be more of a Christo-Fascist. That's why I found Kirk immediately blaming "the left" without knowing anything so weird.