Murder of revange

At seven o`clock at the bar, it was as any other day. Many people were in there and they were drinking, talking and getting drunk. It was just very pleasant day. The day was getting darker and darker. Many people started to go home. Suddenly, a strange man died at the bar. Everyone in the bar were surprised.
Later, investigator invested that Michael was the person who was killed and his friend named Jack was at the scene of death. He was drinking with Michael when he was died. According to Jack, he didn`t know anything about Michael`s death, but there was a poison at michael`sbottle and Jack was the person who was at the nearest place at Michael. Jack said he was innocent but everyone thought he was criminal. However, police found someone spilling some kind of liquid. Finally, strange man was a David who had grudge for Michael. He got a grudge because he lost all money he had got gembling together with Michael.