I know that some may not agree, but I really do believe that PH OD'd, or perhaps she took something that, with her heart possibly being damaged from her endocarditis, caused her to pass.
LE is currently stating: "He is not charged in connection with Paighton Houston’s death, only with actions authorities say he took following her death which in this case would be burying her.". So how did he get involved? I do wonder if once the tox screen comes back, if they will charge him with something related to giving her drugs etc.
I think we now wait to see what more is released...but this lines up with that theory.
Paighton Houston update: Man charged with abuse of corpse, no physical trauma led to death