Adaalat S01 E35 Raaz Angry Colonel Ke Khoon Ka

There is a whooping property of 90 crore rupees for Koyal with her uncle Rt. Col. Manek Dhanrajgir is the official caretaker. The Colonel refuses to give money to Koyal as she has not completed 25 years and then the Colonel gets killed. Who killed Rt.Col. Manek Dhanrajgir?