2014/12/22 Headlines: Killer of NYPD Officers Had Criminal Past, Mental Health Issues; Families, Protesters Condemn Targeted Killing of NYPD Officers; Police Union Head: NYC Mayor "Has Blood on His Hands"; Anti-Police Brutality Protesters Hold Silent Vigil After Shootings; Dozens Arrested at Michael Brown-Eric Garner Protests in Minnesota, Wisconsin; Ferguson Prosecutor Admits Calling Witnesses Who Lied; U.S. May Restore North Korea to Terror List; Regime Offers Joint Probe; Obama Urges Congress to Lift Cuban Embargo After Historic Agreement; Castro Calls on U.S. to Respect Cuban Political System; New Jersey Asks Obama to Seek Cuban Extradition of Assata Shakur; Obama Rejects Keystone XL as Boon to U.S. Consumers, Job Market; Obama Only Calls on Female Reporters at Year-End White House Presser; WHO: Ebola Death Toll Tops 7,300; U.S. Frees Four Afghan Prisoners from Guantánamo Bay