The NYPD is asking for the public's help in finding a person wanted for questioning in the killing of Lesandro "Junior" Guzman-Feliz.

Police are trying to locate 20-year-old Frederick Then.

Police describe Then as a Hispanic male, standing 6 feet 1 inch tall and weighing 150 pounds.

Then may have a criminal history, but specifics on past run-ins with the law were unclear.

Sources tell News 12 that Then is believed to spend most of his time in Philadelphia and Paterson, New Jersey.

Junior was 15 years old when he was brutally attacked by a group of men outside a Belmont bodega. Over a dozen people have been arrested in connection with his death.