The shot in July would have been the first, another maybe six weeks later and then perhaps a booster. So you would have to know more information. My sister had her first shot in March, second in April and a booster in October. She died of cardiac arrest fifteen days later.
A former secretary and friend of mine got her shot. A few weeks later she was dead. Her brother got his shot on or about the same time she did. He died the day before she did.
Both were in their mid seventies but active and healthy..... they thought. We all THINK they would still be with us if they had not got the shot.
My husband had his shots April and May. There will be no boosters or covid shots of any kind in the future. He's 72 years old in very good shape, no comorbidities or health issues. I hope we are past the potential danger zone.
I am so sorry. You have my sincere condolences and empathy as well as prayers for your comfort, strength and healing.
Losing a close sibling is very hard.