Akmal, whose brother is married to Qadir's daughter, said the legendary cricketer passed away due to cardiac arrest.
The 67-year-old was born in Lahore in 1955. He was regarded one of the best leg-spinners of his time, taking 236 wickets in 67 Test matches and 132 wickets in just 104 One Day Internationals (ODIs).
He later served as chief selector for the Pakistan Cricket Board (PCB) as well as a match commentator.