A retired Philadelphia police officer has been arrested and charged with allegedly sexually assaulting a teenage girl.

According to Philly.com, Walter Sasse, was charged on Wednesday with nine crimes including unlawful contact with a minor, corruption of minors, sexual assault and indecent exposure.

The charges stem from an alleged sexual assault that happened in 2011, however, authorities believe that the 75-year-old had a relationship with the teen for years.

WPVI has reported that Sasse met the victim when she was 15-years-old at Courtesy Stables, where she rode horses. The retired cop was employed by the stables and investigators said that the girl also began working there and that's when the alleged sexual contact started.

Police would not release any further details about the victim because of her age.

Sasse, who is a 20-year-veteran of the force, was most recently assigned to the PPD’s mounted unit. He was released on $50,000 bond and is scheduled to be back in court on March 25th.