Police are searching for an armed robbed who has struck in Grand Prairie, Irving, Arlington and Fort Worth since June.
The man has robbed Pizza Patron restaurants, MetroPCS stores and a Payless ShoeSource store.
"He enters the store -- we understand that he tries to get a feel for who's in there, what's in there, to see if there's some sort of indicator that might apprehend him quickly -- and then he leaves, and once he comes back, he's relative quick," said Grand Prairie police Detective Lyle Gensler.
Sales representative Maribel Rodriguez said the man robbed her two weeks ago.
"He pulled out the gun, and he wanted the money," she said. "He took me to the back and wanted more. I told him, 'We don't have more money.' He was like, 'Give me the money, or I will shoot.'"
The man walked away with $1,500 in cash.
Surveillance cameras were rolling during all of the robberies.
Police say the man is black, about 30 years of age and between 5 feet 8 inches to 5 feet 11 inches with a pudgy stomach. He wears a black baseball cap with a large American flag on it and black framed glasses and is usually unshaven.
Anyone with information is asked to call police.