That's what happens to drug addicts...her companion had to control her therefore he got her addicted to drugs. I think possibly Daniel's death is more questionable then Vicky's.
Or "so the perp would have you believe."
This scenario has probably been offered here.
Daniel was given the fatal drink by HK$.
ANS knew it and had confronted him.
ANS thereafter, due to grief and fear took more drugs than usual and eventually OD'd.
HK$ did nothing to stop ANS' because he saw an opportunity and did everything possible to make sure he was left in the catbird seat. vis-a-vis guardian/father of DL and "spouse" of ANS.