Bio: Rocky the Lynx had been a Maggia agent who had an encounter with Captain America. When the Maggia decided it wanted to take over Harlem, they sent Rocky the Lynx. Because Captain America would immediately recognize Rocky, he took the masked identity of Diamond Head. Diamond Head created a violent gang called the Diamond Heads, saying "We're as cold as diamonds...as sharp as diamonds...and as hard as diamonds!" They began spreading hatred against white people. The residents of Harlem feared the Diamond Heads and were powerless to stop them.
The Falcon confronted the Diamond Heads. The Diamond Heads framed Falcon for the murder of one of their members. Feeling that, with the Falcon wanted for murder, neither he nor Captain America would be able to interfere, Diamond Head sent his gang to terrorize the white owner of a new business. Captain America knew that the Diamond Heads regularly harassed new businesses and had staked out their target. Captain America discovered Rocky the Lynx in the area, and at the business, recognized Diamond Head to be Rocky. Captain America defeated the Diamond Heads and unmasked Diamond Head to be Rocky the Lynx.