That's a little too detailed and also, doesn't really give the impression that you're NOW able to better deal with emotional and circumstantial difficulties. In fact, it makes it sound like another tragedy would derail you in the same exact way. Nor does it prove that your GPA does not reflect your capabilities.
My suggestion would be to cut down on the details, especially of your friend's death. Also, talk more about how you've recovered and strengthened your resolve since these events.