Harry Parker - Who Wrote Without You by Nilsson (Without You by Ham & Evans) 
This is an original song about Pete Ham, Tom Evans, Badfinger and Without You. -- Harry Parker 
Harry Parker - Pete Ham & Tom vans

Pete Ham and Tom Evans of Badfinger wrote arguably one of the great sad songs of all time, "Without You" recorded by Nilsson. But, the saddest thing about it is that Ham and Evans and Badfinger were cheated out of the royalties for their music by American businessman Stan Polley and sued for millions by their label, Warner Brothers. 
Ham was distraught and was eventually found hanged in 1975 and Evans, who never got over the loss of his friend, took his own life in 1983. 
Harry Parker - Without You by Ham & Evans