It happened around 6:30 p.m. Thursday on the 400 block of East Hamilton Street.
An autopsy was set Friday on the body of 25-year-old Hector Roman-Rodriguez. The Lehigh County coroner has already said, however, that the victim was stabbed and died at Sacred Heart Hospital.
30-year-old Jonathan Rodriquez has been charged in the case.
Allentown police say that happened while Roman-Rodriguez was at his grandmother's home. Assistant Police Chief Gail Struss earlier said the stabbing wasn't a random act.