It said he died of a pulmonary embolism. He is the same age as me, (66). I just had a ultrasound test done to check for that very thing last week. Thankfully it came up negative. Had he done it at the same time, they would have detected it, and could have save him.
These tests are cheap, fast, and can save your life. Everyone over 30 should have it done every few years. Better safe than sorry.