Subway Murder

A janitor in Andheri station finds a dead and informs CID of the same. When the team reaches there, they find out his name, Ranjan and also manages to locate a CCTV camera pointing the crime scene. While watching the recording they come to know that he was murdered but the murdere's face was not visible. They also saw that a man witnessed his murder but got scared and ran away. Will CID be able to find that witness? Will they be able to nab the murderer?