The music entrepreneur, who helped launch the careers of Dave and Ed Sheeran, died in February at the age of 31.
Brenda Edwards, a singer and Lose Women panellist, said in a statement Tuesday that she was “in a state of shock” after finding out how she died.
“I have sadly learned that the cause of Jamal’s devastating passing was due to cardiac arrhythmia,” she wrote.
“[This was] caused by having taken recreational drugs and I wanted to address this myself to everyone who loved, admired and respected my son.
“Since finding out the news I’ve been in a state of shock, and I am still trying to process it.
“But it’s so important to me that I do address it as no mother or any loved one should have to go through what Jamal’s sister, Tanisha, and I have been through since he passed.”
The 53-year-old released the statement on Twitter following an investigation into Jamal’s death and it was adjourned to the West London Coroner’s Court.
She said: “We have been so incredibly touched by the outpouring of love and support, and you are all helping us try and get through the unimaginable.”
Edwards described her son as having had the “world at his fingertips – a zest for life and he was unwittingly taken away far too soon”. “Yet we have to come to terms with what has happened, and Jamal is proof that this can happen to anyone,” she continued.
“He was deteriorating despite treatment and died on 20 February of this year. A post-mortem has been undertaken and I have reason to suspect that the death was an unnatural death.”
The inquest was adjourned to be resumed in eight weeks’ time.