(CNN) Nick Gordon, the former boyfriend of Bobbi Kristina Brown, died from a heroin overdose, according to Florida's Districts 5 & 24 medical examiner's office.

The cause of his death was ruled as heroin toxicity, according to the autopsy report.

Gordon died in Seminole County on January 1 at the age of 30. The autopsy was performed the following day.

Caffeine, morphine and naloxone, a drug that reverses opioid overdoses, were among a series of substances found in Gordon's system, according to toxicology results.

He died three years after he was found liable in a civil case for Brown's death. He was was taken in by Whitney Houston when he was 12 years old and raised alongside the singer's daughter, Bobbi Kristina Brown.

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