When O.J. Simpson was acquitted of murder in 1995, the absence of the weapon prompted much speculation. Police are now testing a knife allegedly found years ago and kept by a retired police officer.
Local police and emergency services in the U.S. have been preparing for a new reality: a strategic attack by terrorists who use diversionary tactics to maximize chaos and death.
Officials say the man killed Sunday was the subject of a federal warrant for violating probation for a 2000 bank robbery. There's also word that he lived under a stolen identity.
Los Angeles Mayor Eric Garcetti and Police Chief Charlie Beck are calling for calm and patience, as three investigations are underway into the police killing of a homeless man Sunday.
The LAPD says a Taser did not subdue the man, who was struggling with officers on the ground when he was shot to death. Police say the man tried to grab an officer's gun.