A man, whose identity was not available, entered Jones Grocery in the 600 block of 9th Street North around 8:30 p.m. dressed in black and armed with a shotgun, Texas City Police Department Captain Brian Goetschius said.
An employee outside smoking a cigarette was able to alert store owner Joe Kainer Jr. before being ordered away by the gunman, Goetschius said.
The gunman entered the store and demanded money at Kainer's back counter, police said. After putting the cash in a bag, he demanded more money from the front register.
At the front counter, Kainer was able to pull his gun out, police said.
"As (the gunman) was opening the door to leave, which is within arm's length of the counter, still in possession of the shotgun and money, he was shot," Goetschius said.
He robber was pronounced dead on the scene. No charges filed against Kainer at this time, authorities said..
"We believe he acted within his rights under the laws of the state of Texas," Goetschius said.