UnitedHealthcare CEO killed: Insight into these types of investigations

After UnitedHeathcare CEO Brian Thomspon was gunned down on a New York City street on Wednesday, investigators found "bizarre" engravings on the bullet casings left on the scene -- the words "deny," "depose" and "defend," according to law enforcement sources. Police say the alleged gunman lied in wait for the health insurance executive to walk past before shooting him. Lieutenant Randy Sutton (Ret.), founder of Wounded Blue, details what could be happening in this investigation.