I just read the article and the journalist did a really good job of getting the medical examiner to cough up a few more details, as well as other people in Lamo's life.
Based on this evidence, I am relatively confident that Lamo died from acute toxicity that was accelerated by advanced stage kidney failure.
The cause of this kidney failure is almost without doubt due to the quantity, type, and lack of purity of all the internet drugs he was taking. He was obese at the time of his death, stealing pills, walking with a limp, and falling asleep in his food according to the people he lived with before he was evicted and transfered to a different apartment by himself.
He also hurt his leg on the night of his death and likely ingested a "normal" dose that for most people would be fine, but for a kidney failure patient would be deadly.
I am confident that he had kidney failure because his serum creatinine score was 55x above normal. Mine is just 3x above normal and I already have to eat a really restricted diet =0