C.I.D. - Season 1 Episode 97

A builder named Jayesh Kumar is murdered at a construction site of an apartment complex. An inspection of the building reveals two empty bullet shells, which reveals that the gun was fired from inside the building. An investigation of Jayesh's home reveals a threatening letter that was recently sent to him as well as an audio cassette also leaving a death threat. It is also found out that Jayesh did not get along very well with his family. Will CID be able to find out the identity of the killer with these clues?