I don't believe dreams usually predict the future like that, in a divination sort of way, though I'm not saying it's absolutely impossible. I'm surprised you haven't had the first dream lots of times before considering the details of what happened to you.
Usualy when someone dies in a dream it is a metaphor for something ending, like a relationship, or perhaps your friends are moving away out of town, or they already have moved away, or they're just growing older - you get the idea?
I think if you are actively trying to increase your skills in divination you may have dreams about divination but they are unlikely to turn out to be true; I think most successful divination like
crystal ball gazing is carried out when you are awake, using a different type of consciousness than the one you use when you are asleep.
