Will we ever find out what happened to Danielle Imbo and Richard Petrone?

LIMITED SOLUTIONS - these cases being solved are highly improbable - most unfortunately. Danielle Imbo and Richard Petrone were two people just hanging down at Abilenes on south street in Philadelphia (2005)- they walk to their truck and disappear into the night - FOREVER - what happened to them? The case of Amber Long and her mother, Stephanie is similar in that while Amber alone was the one who was killed, and there was an eyewitness (her mother) there's never been any other leads for this...