Investigate the circumstances surrounding the tragic death of 13-year-old Dilshan, who was shot while unlawfully entering army residential quarters to gather mangoes and almonds. The investigation was compromised by a perpetrator linked to the police. The incident sparked widespread outrage across the nation, with the public calling for severe consequences for the individual responsible. How did the CBCID Police reveal the involvement of an army officer holding the rank of Lieutenant Colonel in this case?