S1·E674 Do Qatil Ki Paheli

Two guards come across a dead body of an old man and CID is called to investigate. Just then Abhijeet gets a call informing him about another murder that happened in other part of the city in a parking lot. Both the dead bodies are sent to Dr. Salunke and he informs them that they were both murdered by two different people with different techniques. Why would someone want to kill an old man? Even with two different killers could the case be connected?