Has to be Kenneth Tsang Kwong in The Final Verdict
Unlike people like Nick Cheung og Gallen Lo who at least has some redeeming features and is also a bit remorseful at the end, this fellow is evil to the core and unrepentent till the end
On his death bed in prison,he actually told Adam Cheng that he did not regret what he did at all and even though he is in jail and dying,at least he had 15 years of wealth and power while Cheng ,who he framed for murder after bribing the whole police force,had nothing.
btw his crime - he slaughtered his uncle,aunt,cousin & his wife & child and a neighbour with a meat cleaver thus inheriting his uncle's fortune.