[Robert DeLong]

“Regarding the reports of an overdose, we want to clarify that they are not accurate as far as the doctors and my family know. Emily was receiving the treatment and help she needed at the time of the incident to overcome her struggles,” Michael said in the update.

I still think it is drug related. Depending on the drug(s) she was trying to eliminate from her life, it's much harder than most people realize.

[House Atreides]

“ I still think it is drug related. Depending on the drug(s) she was trying to eliminate from her life, it’s much harder than most people realize.”
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Yes, you can die from complications of physical withdrawal.