The Arlington Police Department said Saturday it arrested 21-year-old Rontrell Jackson for shooting and killing his grandmother.
Officers responded to a shooting call on Friday afternoon at an apartment complex on Carriage House Circle near East Lamar Boulevard, police said. They found the victim, a 68-year-old woman, unresponsive on her patio; her body had been covered by a blanket.
Paramedics found that she had been shot, and she was pronounced dead at the scene.
During their investigation, detectives learned that the victim and Jackson had recently been in a heated argument which led to the victim withholding allowance money, police said…