Nikki, your friend, I assume, can't get over the death of a person he/she loved.
This is a very difficult subject, there are no easy answers.
If your friend could find somebody to do some EMDR (you can read my hub about it) on the topics that hurt more.
He needs to analyze the various moments that hit more right now his memory with pain. For instance if he saw the person actually die, then this is a very traumatic memory. Or the moment when he first learned of the loss. Or the moment when he first understood that the person was going to die.
These memories have to be worked with through EMDR (this is the easiest method), at least 3 treatments for each question.
The pain won't go away, but the bitter edge will get blurred, it can become painful sweet memories of the person he loved instead of bitter pain.
And then just assure him that time is the great healer, he will need some patience with his own pain.