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.
But, for some reason, didn't let her drown a few weeks ago, when he could've ... or, when he could've not asked Moe to save her. *ho hum*