A police officer in northern Florida is being suspended without pay for one month for firing his stun gun in the back of a 61-year-old woman.

A video taken last fall showed Tallahassee Officer Terry Mahan firing his stun gun at Viola Young as she walked away from him. She fell face-first to the ground.

Tallahassee Police Chief Michael DeLeo announced Monday that police had concluded an internal investigation into the incident.

DeLeo said Mahan's actions were legal but they did not meet department expectations.

Young was charged in September with resisting and obstructing an officer without violence. Prosecutors soon dropped the charges.

Charges were also dropped against three of Young's relatives arrested at the same time.

The officer who made the initial arrests was suspended for two days.