An inmate at Rikers Island is dead after allegedly being attacked by another prisoner.

Sources tell NY1 27-year-old Artemio Rosa approached the 35-year-old victim from behind while he was seated and choked him. 

Sources say Rosa is a part of the Trinitarios gang, the same group prosecutors believe is responsible for the murder of a Bronx teenager last month. 

Rosa was arrested just last month on charges of criminal mischief and assault.

Sources say correction officers struggled to get Rosa off the victim.

Police say the man's name will be released once his family is notified.

The city says it's investigating the incident.