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"We had what we believed were a number of promising leads. That didn't pan out, and we've reached that stage where all we can do now is appeal to the community and see if we can get some additional help," said LAPD Lt. Guillermo Rosales.
Detectives say they are confident there are people out there who know young Diego's killer.
Diego was shot to death on a busy Christmas Eve after crossing Santa Monica Boulevard to do some Christmas shopping.
Diego's father made a plea Wednesday for witnesses to come forward. It has been a long seven months for the Cruz family as they hope for closure in what appears to be a random shooting of their son.
"Unfortunately our leads have dried up. We haven't been able to make the progress to give the Cruz family a piece of mind and to bring justice to this community," said L.A. City Council member Eric Garcetti.
A $50,000 reward in the case is offered if you know anything about this murder. You are asked to contact detectives from LAPD Hollywood Division at (213) 972-2913. You can remain anonymous.