I'm not sure if there's been any discussion of the suspect's shoes. I went through the footage and grabbed a few screenshots. A couple of things stood out to me:
1. No visible laces
2. Flat heel/ molded platform sole
3. Traditional-style moc toe construction
4. Contrasting outsole, likely rubber
5. Toe spring (or bumper)
6. Non-leather material. Probably canvas or mesh.
I don't know how helpful it is, but the closest match I could find was the Carhartt Men's Haslett Moc Toe Boot in black canvas..
(FWIW, I used to sell shoes)
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