Former FBI agent: Somebody knows something

WHAT'S IT GOING TO TAKE FOR POLICE TO SOLVE THESE CASES? THEY HAVE SAID THINGS ARE WIDE OPEN, AND ARE NOT EVEN WILLING TO SAY PUBLICLY WHAT GENDER OR RACE THE KILLER MIGHT BE. FOX 13'S EVAN AXELBANK SPOKE TO A FORMER F-B-I INVESTIGATOR ABOUT WHAT THE KEY PIECE OF EVIDENCE COULD BE.