HOUSTON (KTRK) -- A 20-year-old cleaning a handgun accidentally shot and killed his father Tuesday night in southeast Houston.According to authorities, Carlos Zetino Jr. accidentally shot his 39-year-old father, Carlos Zetino Sr., in the stomach at the home on Regal and Arrow Street.Carlos Zetino Sr. later died at the hospital.The son told Eyewitness News that they were trying to fix the firing pin on the gun when it went off."The bullet went straight into his stomach," Carlos Zetino Jr. said. "From there we were trying to help him but we could tell he wasn't bleeding from the outside but from the inside."He says, along with his brother, they tried to save their father but he stopped breathing."I love him and I miss him," he added. "I can't do nothing without him."Investigators ruled the shooting an accident.