Hi Sunny, My brother also passed away suddenly in December of 2024. He was just 61. He was also a smoker. He had a distant past methamphetamine and alcohol addiction, but had been clean for over 25 years. Five years ago, he was treated for throat cancer and was declared clear. In the months before he died, he was being evaluated for an aortic valve replacement. He was super stressed about this, but his wife and I were both shocked that he died suddenly. The county in Virginia declined to do an autopsy because of his medical history. I inquired about an optional one, and it was going to be well over $5K, and as his wife said, he would still be gone. I used to work for the Medical Examiner and I called one of the pathologists I know well, and given his history, she said they would have declined to autopsy as well. So I asked the mechanism of death, and she said it was most likely a heart arrhythmia brought on by the aortic narrowing, and he would have lost consciousness within seconds and he probably never knew what was happening. She said an autopsy likely wouldn't have shed any light on exact cause of death, unless it was a ruptured aneurysm or something like that. In any case, it has been devastating to lose my only sibling, and I feel for you. I am sorry for your loss and I understand wanting more information.