A large crowd of angry residents confronted police officers in Missouri after an officer fatally shot a teenager who witnesses say was unarmed.
Police said Michael Brown, 18, physically assaulted the officer from the Ferguson police, who then fired multiple shots at Brown after he left the car on Saturday.
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Mack entered her plea in federal court in Brooklyn. The judge refused a request by her lawyers to release her without bail.
Officers investigating a reported break-in on Friday found 22-year-old Roger Alvarado asleep in the pop star's home in Tribeca.
Billy Jeeves is said to have fled the scene in Hither Green, south-east London, after Henry Vincent was fatally stabbed by the pensioner.