officer reunited gary with his best friend. i love that picture. >> money shot. a >> so beautiful. >> arrow says i need a big ♪ ♪ ♪ captioning sponsored by cbs >> brennan: breaking news: deadly mass shooting at a grocery store in western tennessee. the unfolding situation tonight, as police describe the scene as "horrific." at least a dozen people seriously injured at a supermarket outside of memphis. what we are learning about the victims, the shooter, and where employees were hiding. >> i'm still worried about my co-worker that got shot and hit. i'm still worried about him. >> brennan: pfizer booster shots. the final step before the c.d.c. gives the go-ahead for tens of millions of americans to get a third dose. growing humanitarian crisis. with tens of thousands of haitian migrants fleeing towards the u.s., our interview with the secretary of homeland security about the southern border. arrest warrant issued.