I wouldn't call, obviously has moved on with his life and doesn't care about you.
Why get upset over his death when he is basically a stranger?
That's a rational position. Like all humans, the OP isn't entirely rational. The very fact that he would ask random strangers on a forum for opinions makes it clear that in some way the OP is emotionally involved and does care. Maybe about his father, maybe about some more abstract sense of what might have been, maybe for some reason he doesn't understand and couldn't explain...but he must care to some extent about something related to the situation. So calling makes sense for the OP for the sake of his own peace of mind, if only to rule out the possibility of later regretting not calling.