the store and then shot his wife, an employee, in the leg

A married father-of-three has been shot dead after he tried to stop a gunman who opened fire inside a Walgreens.

Gym owner and ex-Marine Anthony 'TJ' Antell Jr., 35, was gunned down at the Arlington, Texas, store on Monday when he confronted the suspect, 22-year-old Ricci Bradden.

Antell, who ran the CrossFit Abattoir gym, was with his wife Crytsal in the drugstore when the chaos unfolded.

Married father-of-three Anthony 'TJ' Antell Jr. (pictured with his wife Crystal) has been shot dead after he tried to stop a gunman who opened fire inside a Walgreens in Arlington, Texas

The 35-year-old (pictured with his wife and three children) was gunned down at the store on Monday when he confronted the suspect, 22-year-old Ricci Bradden

Antell, who ran the CrossFit Abattoir gym, was with his wife Crystal in the drugstore when the chaos unfolded

Bradden walked into the the store and allegedly shot his wife, who is an employee, in the leg.

He then tried to flee the scene.

As Bradden tried to drive off, Antell when outside to the parking lot and picked up a gun he owned from his car in a bid to stop him, the Dallas Morning News reported.

The suspect then turned around and shot Antell in the head, according to police.

Images taken from above the scene show a white sheet draped over his body.

Bradden has since turned himself in to the police. His wife has not been identified by police.

She has been treated for non-life threatening injuries in hospital.

Arlington Police Lt. Chris Cook praised Antell for his actions and described him as a Good Samaritan.

He told Fox 4: 'Very terrifying for people that had to watch and see, especially the Good Samaritan being shot and killed just trying to help out trying to keep the suspect from leaving.'

Ricci Bradden, 23, walked into the the store and allegedly shot his wife, who is an employee, in the leg. He then tried to flee the scene