Sutherland Springs church massacre victims and their families can sue the store where the suspect bought the gun used in the mass shooting, a Texas judge ruled Monday.

Jason Webster, an attorney for several victims and families pursuing the lawsuit, alleges the store where suspect Devin Kelley bought the AR-style gun conducted an illegal sale.

Kelley allegedly stormed the First Baptist Church in rural Sutherland Springs on Nov. 5, 2017, and opened fire, leaving 26 dead, according to police, who have included an unborn child in the death count.

State troopers guard the entrance to the First Baptist Church after a mass shooting that killed 26 people in Sutherland Springs, Texas, Nov. 6, 2017.(Mark Ralston/AFP/Getty Images) State troopers guard the entrance to the First Baptist Church after a mass shooting that killed 26 people in Sutherland Springs, Texas, Nov. 6, 2017.

Kelley, a 26-year-old military veteran, died after the shooting.

The attack was deemed the worst mass shooting in Texas history.

About 18 months before the massacre, Kelley went into an Academy Sports + Outdoors store in Texas where he bought an AR-556 model 8500, Webster told ABC News on Monday. The gun came with a 30-round magazine within the package, Webster said.

An undated photo of Devin Kelley.(Texas Department of Public Safety/AP) An undated photo of Devin Kelley.

Kelley showed his Colorado driver's license as part of the sale process, Webster said.

Under Colorado law, an individual cannot buy, sell or transfer any firearms or magazines over 15 rounds, Webster said.

Academy was expected to comply with the laws of both states but failed to, he claimed. The store "knew or should have known at that time that he was a Colorado resident and he couldn't purchase" that weapon, Webster said.

Twenty-six crosses stand in a field on the edge of town to honor the victims killed at the First Baptist Church of Sutherland Springs, Nov. 6, 2017, in Sutherland Springs, Texas.(Scott Olson/Getty Images) Twenty-six crosses stand in a field on the edge of town to honor the victims killed at the First Baptist Church of Sutherland Springs, Nov. 6, 2017, in Sutherland Springs, Texas.

A spokeswoman for Academy Sports + Outdoors said the company would not comment on ongoing litigation.

According to The Dallas Morning News, Janet Militello, an attorney for Academy Sports + Outdoors, said in a Thursday hearing that "Academy is not responsible" for the "horrible tragedy" as Texas laws allow the store to sell high-capacity magazines.

Bexar County District Court Judge Karen Pozza on Monday denied the Academy's request that the lawsuit be thrown out.

That means the lawsuit can proceed to a jury, Webster said.

The lawsuit claims the store owed the victims "a duty of reasonable care to ensure the safety, care and well-being of the public... By selling the gun and 30-round magazine to Kelley without the proper oversight and by failing to follow policies, procedures, and applicable law in selling firearms pursuant to the laws, defendant supplied Kelley with a dangerous instrumentality."

The lawsuit asks for millions in damages.