The Essex County Prosecutor's Office says Samuel Gbotoe was walking in Irvington on March 13 when he was attacked while walking on Isabella Avenue and University Place.
Gbotoe, a security guard at Newark Airport, died from complications of blunt force trauma three months later.
The investigation remains active and ongoing.
A $10,000 reward is being offered in the case.
Anyone with information is asked to contact the Essex County Prosecutor's Office Homicide/Major Crimes Task Force tips line at: 1-877-847-7432 or 1-877-TIPS-4EC.
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