Chief Minister Jayalalithaa on Monday felicitated the CB-CID team, led by K. Sekar, Additional Director General of Police, which cracked the mystery behind the killing of the 13-year old boy Dilson in an Army enclave here. She presented certificates of appreciation to the officials who were part of the team. DGP K Ramanujam and Additional DGP (Intelligence) T. Rajendran were present.