Ivor, I have no doubt he loved her in his own twisted way. Most abusers do love their victims. I imagine Wang had a childhood as twisted and as volent as Haley did. Probably wasn't raped, but was most likely physically and emotionally abused by the old man. Along with the rest of the family.
And the coroners have said this was not an OD. Toxicology reports are made on a plethora of possible conditions, not just drugs.