Death is stupid
"This exploration of grief and mourning recognizes the anger and confusion that a child feels around death while offering possibilities for celebrating life and love. This is the second book in the series, Ordinary Terrible Things, following the first installation, Divorce is the Worst"--
Is daddy coming back in a minute? : explaining (sudden) death in words very young children can understand
Alex and his father are on a boys-only weekend when his father has a heart attack. Alex finds someone to call the ambulance, but his father dies on the way to hospital. His mother comes to get him and explains why his daddy can't come back.