Law enforcement officials say Gavin Long, who killed three Baton Rouge police officers Sunday, drove to that city from Dallas.
While here, he proselytized to workers and customers at several Oak Cliff barbershops.
Long entered three barber shops trying to sell his self-published book and preaching about nutrition and wealth.
He wore a body camera during the encounters, and Fox 4 has excerpts as well as interviews with the barbers here.