By the way, sincere thanks for keeping on top of this case and ensuring we are informed as information leaks and is released.
Medicines such as RobitussinnDM contain acetaminaphine, I.e. Tylenol. One side effect of Tylenol over use is liver damage, i.e. sorosis. According to the tox report/autopsy, Martin had signs of liver damage. Likely caused by Sizzurp a.k.a.Lean a.k.a. Purple Drank