Levi Rosenblatt, 22, was attacked at the headquarters of the Chabad-Lubavitch community last week.
A 54-year-old man was stabbed several times in the back and chest, police said.
Ken Goodwin murdered Justin Fallu and stabbed three other teenage boys in Pelham Parkway, police said.
The victims of the stabbing are not cooperating with police who are investigating the assault.
Christian Morales was charged with stabbing Carlos Santos in the head on Liberty Avenue in June.
An 18-year-old was repeatedly stabbed in the Elder Avenue subway station Thursday, police said.
The victim was 46-year-old Rigino Montero of Tiffany Street.
Iman Thomas, 38, was found with stab wounds in the backyard of her East 43rd Street home, police said.
Juan Rosario was shot in the torso while stabbing his wife in Kingsbridge Heights, police said.
Two men riding the northbound train were attacked by a group near 96th Street, police said.
The suspect stabbed the victim during an argument, then fled the scene, police said.
The attack took place inside a Canarsie apartment, the NYPD said.
Francisco Carvajal was shot dead inside the Ocean Parkway home of his ex-girlfriend, police said.
Kenneth Suden, 41, of Ridgewood, has been charged with attempted murder and robbery.
Joshua Acosta, 18, was stabbed to death Monday in The Bronx.
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