Investigators told News 12 a large group gathered outside the Atlantic Terminal Mall before the stabbing, and multiple people ran from the scene.
Police said Hernandez was taken to a hospital, where he died.
His mother, Marisol Miranda, said she saw her son in the Bronx just seven hours before his death.
Now she’s demanding answers.
“I feel like they ripped him from me,” Miranda said. “No matter how hard this is, he didn’t deserve to die like this; and I just want justice for him.”
As of Tuesday evening, police said no arrests have been made.
They ask anyone with information to give them a call.