Dotson was arrested July 21 after telling FBI agents he shot Dennehy when Dennehy tried to shoot him , according to the arrest warrant affidavit .
Dotson , 21 , was arrested and charged on July 21 after reportedly telling authorities he shot Dennehy after Dennehy tried to shoot him .
Dotson told FBI agents that he shot Dennehy after the player tried to shoot him , according to the arrest warrant affidavit .