Grandpa shot dead inside McDonald's in blue city while getting Happy Meals for grandkids

Arbaiza was ordering Happy Meals for his two grandchildren when a gunfight between two groups of men broke out, ending with shots fired inside a restaurant filled with customers and their children, according to authorities. 

"I couldn't leave the kids alone. I could not go inside," Teresa told KHOU 11.  "The kids were crying, and they were scared."

Teresa noticed a man with a gun in her vehicle's rearview mirror seconds before she heard shots ring out. Teresa called her husband's cellphone when she did not see him running from the restaurant. 

"I'm dying. I'm going to die," were Arbaiza's last words, Teresa told KHOU 11. 

"We are deeply saddened by this senseless violence that led to a tragic loss of life," Stuart Brown, the owner and operator of the Houston McDonald's, told Fox News Digital in a statement. "Our thoughts are with the victim's family, and we are assisting the local police department in any way that we can."

One of the men involved in the shooting was also struck by gunfire and taken to a hospital, where he was interviewed by detectives. Investigators used security camera footage to locate a vehicle and have identified multiple suspects involved in the brawl. 

Authorities also revealed that a handgun used in the shooting was modified using a "Glock switch" that allows the user to turn the semi-automatic gun into an automatic weapon.