By Selena Hernandez, CBS 11 News

GRAND PRAIRIE (CBSDFW.COM) – Dylan Pham just celebrated his one-year wedding anniversary last month. Today, he’s mourning the loss of his bride.

“I can still see them in my mind,” he said.

Michelle Ta, 28, was shot and killed, Grand Prairie police say, by her own brother-in-law.

“I think he planned it out already,” Pham said. “When the family gathered around, in a circle, that’s when he took out a gun and shoot everyone he can.”

According to Grand Prairie Police, Tan Do, 35, drew a gun after a domestic dispute and opened fire on his wife’s family during a birthday party at the Forum Roller World skating rink.

Do’s wife Trini Do, 29, was among those killed. CBS 11 News learned the couple was married about 10-years and had a tumultuous relationship.

“They had been arguing lately, a few days before the birthday party,” Pham said.

Trini’s siblings Hien “Kenny” Ta, 21, and youngest sister and victim Lynn Ta, 16 were all killed.

As was Trini’s sister-in-law, 25-year old Thuy Nguyen. Four other family members, including Trini’s parents, were wounded in a spray of gunfire unleashed by Do during his son’s birthday party. Do fatally shot himself during the spree.

“It was just out of the clear blue – just gunfire and I gathered my employees and hid them,” said Walt Hendrick, owner of the Forum Roller World.

Hedrick worked Saturday night and described the crime as a calculated, cold-blooded killing.

“He came back by each and everyone he shot originally and shot them again,” Hedrick said.

Pham said he cannot comprehend the callous, violent tragedy.

“We do know he is high-temper – but nothing major. We didn’t think he would do something like this,” he said.

Do eventually turned the gun on himself and died. The majority of the Ta family lives in Fort Smith, Ark. Funeral arrangements are still pending.

Meanwhile, Hedrick says the tragedy was unfortunate, but it’s not going to stop him from running his business: He reopened the Forum Roller World Sunday to show skating is still a safe family outing.