Seventeen-year-old Kenny Chen was stabbed to death near his home in Bensonhurst.
Now, four other 17-year-olds are charged in Chen's killing.
Police have not released a motive, however, investigators say Chen had a large amount of marijuana on him when he died.
The suspects were identified as Peter Sedeno, Daquan Jackson, Dayshawn Young and Daine Daley.
Sedeno is charged with second-degree murder and gang assault. The other three are only facing gang assault charges.