(CNN) Nick Gordon, the former boyfriend of Bobbi Kristina Brown, has died three years after he was found liable for her death.

Gordon's attorney, Joe Habachy, confirmed his death to CNN but did not provide details on the cause. He was 30.

"My heart is heavy today after learning that my long time client Nick Gordon died ... while I cannot speak to the specific circumstances of his death, I can say that it's been truly heartbreaking to have witnessed first hand the total devastation that drug addiction has wreaked upon a group of young friends, all of whom were loved and had immense potential," Habachy said in a statement Wednesday.

Gordon was taken in by Whitney Houston when he was 12 years old and raised alongside the singer's daughter, Bobbi Kristina Brown.

Gordon and Brown became romantically involved after Houston's death in 2012, and tensions between the Gordon and Houston families over the relationship were part of the storyline on Lifetime's short-lived reality show "The Houstons: On Our Own."

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