Last month Dajerria Becton and her legal guardian, Shashona Becton, filed a $5 million lawsuit in federal court against the city, the McKinney Police Department and former Corporal Eric Casebolt regarding an incident in 2015 in which Casebolt slammed Becton, then 15, to the ground at a neighborhood pool party.
According to the Dallas Morning News, the suit alleges Casebolt violated the girl's constitutional rights by using excessive force and holding her without probable cause. The family also claims that the city and the police department are to blame for her injuries for not training officers adequately.
Video of Casebolt kneeling on the teenager's back while she cried out for her "mama" quickly viral in June 2015.
At a news conference Conley said, "Our policies, our training and our practice do not support his actions."
However, the city disputes the claims in the lawsuit in a statement.
"The City of McKinney denies the claims alleged against it and the McKinney Police Department, and as such, will vigorously defend the recently filed lawsuit," the statement reads. "McKinney prides itself in cultivating the highest standards of training and professionalism for our officers, and it strongly believes that its standards and training will withstand legal challenge."
A grand jury chose not to indict Casebolt last summer.