Authorities confirmed Friday that a man was arrested on Tuesday for a separate robbery and was later connected to the violent incident inside the store.
Surveillance video shows a customer browsing through the electronics store when he's suddenly knocked to the ground and decked by a man who swipes his iPhone. The suspect then heads out the emergency exit.
Los Angeles County Sheriff's Department Sgt. Jeff Bishop said while the victim was rattled, he was fortunate he wasn't more seriously injured.
Before the robbery, store security tracked the man as he walked through the store and appeared more interested in other customers than the electronics products.