Accused: Guilty or Innocent? Season 6 Episode 1 Murdered My Boss or Innocent Employee?

After a construction company boss is found shot dead in his office in 2005, no arrests are made. An employee helps police with their investigations. He says he'd been bound and gagged by a gang just before the shooting. But 14 years later police charge him with murder. Is he a cold-blooded murderer or an innocent employee?