Now for the trick behind the murder, I think that Newton's first law, i.e. moment of inertia was used to deal with the victim. The vase was kept on the edge of the cupboard, there was a mechanism installed beneath the cupboard which if activated would slide the cupboard away from the wall.
Now given the victim's habit of sitting on it while smoking proves that the victim was sure that cupboard was seemingly rigid(won't move from weight) so he didn't took precaution and was set up by the culprit to reach for something using his right hand(the smudges on his right hand, his odd body position seems to support this hypothesis) and thus activated the mechanism, which toppled the vase on his head. As he was reaching for the thing quite deeply so his face was vertical and faced his left cheek away from the wall, so the injury caused on his left fore head and he died on the spot. To make it look like that someone attacked him with vase(filled with water and flowers) the culprit poured a little water on his shirt collar.
For the culprit, we can easily exclude the man. The waitress was hiding from the loan sharks but the man discovered it only on that eventful day. From the expression of the waitress we do find that it was the first time she heard this stuff. So previously she was only approached by the victim to be his GF nothing more was there.
Now apparently the manager lacks the motive but given the fact that manager's brother has already complained against him and the victim was the ex-live in partner of the manager. The victim was known for his revengeful nature and if this word of complaining even came to his ears the manager's life would be destroyed, the victim would have waited till the manager got married and then after taking over as the new manager would have showed some inconvenient pics./stuff of the ex-manager. So this was the motive of the manager. And I rule her as the killer, but the waitress can be also the killer using the same trick but I think that is far less likely.
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