Steven Rodriguez, who was better known as A$AP Yams or Yamborghini, died aged 26 on 18 January at Brooklyn's Woodhull Medical Centre.
He founded the US rap collective A$AP Mob along with fellow New Yorkers A$AP Bari and A$AP Illz.
Now the New York Times reports that his death was caused by acute mixed drug intoxication.
Opiates and benzodiazepines were found in his system and it was ruled an accident.
After his death artists paid tribute to him on social media.
Drake tweeted: "Rest in peace Yams. A$AP is family."
Azealia Banks wrote: "ASAP YAMS should be remembered as a leader, an innovator and most importantly as an important part of NYC youth culture."
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American rapper A$AP Yams died of an accidental drug overdose, according to New York City's chief medical examiner.