Philadelphia police are preparing to announce new developments in the decades-old "Boy in the Box" investigation Thursday.

A press conference will be held at 11 a.m. by Police Commissioner Danielle Outlaw and a team of investigators to announce new details in the 1957 murder of a young boy that has garnered national attention, including his identity.

The boy, believed to have been 4-6 years old at the time of his death, was found severely beaten and wrapped in a blanket in a box on a street in Fox Chase, FOX 29 Philadelphia reports.  

"His blond hair had been cut short in a crude fashion, with clumps of hair still on his body. The back of his head had been smashed in. He was face up in the box, which was stamped ‘fragile,’" The Philadelphia Inquirer states. 

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Boy-in-the-box sketch

The 1957 murder of a young boy, known as the "Boy in the Box," has remained a mystery for decades, but now, police say they will identify the boy in a press conference Thursday. (Philadelphia Police Department)

Limited leads emerged over the last 65 years to identify the child.

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Philadelphia Police badge

Philadelphia police are expected to announce the identity of the "Box in the Box" found in 1957, 

The Vidocq Society - described on their website as "scores of seasoned professionals" who "provides pro bono expert assistance to the law enforcement community in solving their cold case homicides" - pushed for answers using DNA developments and genealogy testing.

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"Through hard work, investigational good luck, science, and the grace of God, we will put a name on that memorial," Chief Science Officer for Vidocq Dr. Michael Rieders said.