My dad could still be alive, but he's not

I'm sorry this happened to you/Jenn.

I lost my brother to a heart attack aged 50, but he died immediately. In the end it was very quick, but he had warning signs for years. Look after yourselves, people.

Let me add one thing: high blood pressure is both very bad and sometimes has no clear tell signs, and cake people doing sedentary work like IT folks it's very common. Get tested regularly.