Kelley died after being struck with a car while attempting to arrest a suspect.
The Department of Public Safety says the suspect, Colby Ray Williamson, has been charged for his death.
Hutto police tried to make a traffic stop at Herrera Trail but Williamson sped away.
Williamson's car struck a curb, spun out, and hit a fire hydrant. That's when Williamson ran away.
According to authorities, Sgt. Kelley attempted to apprehend Williamson, and he responded by engaging in a struggle with Sgt. Kelley. Williamson then gained control of a Hutto Police Department vehicle and struck Sgt. Kelley with the vehicle.
During a news conference, Hutto City Manager Karen Daly says Sgt. Kelley leaves behind a wife and two children under the age of ten.