A man wanted for two separate Providence homicides is now in police custody after being found in New York City.  Malcolm Querido is a person of interest in last month's killing of Kareem Barnes in a Camden Avenue apartment building.  He's also a suspect in the stabbing death of Robert Bullard in an Allston Street apartment last September.  Querido has a long record of committing violent crimes, and was on probation when the killings occurred.