Even in death, Ozzy Osbourne will never be far from his fans. After mourners left thousands of tributes to the late heavy metal legend on Black Sabbath Bridge in Ozzy's native Birmingham, England following his death from a heart attack on July 22 at age 76,

Jack Osbourne opened up about his late father and rock legend Ozzy Osbourne in an emotional Instagram tribute Wednesday, revealing that he is struggling with the loss while celebrating how much of a blessing it was to have the iconic musician as his dad.

The New York Times now reports that the rocker’s official death certificate lists his cause of death as “acute myocardial infarction” – typically meaning the death of tissue resulting from a failure of blood supply to an organ – and “out of hospital cardiac arrest”, or heart attack.