Case File

DNA Genealogy Solves 65-Year-Old Murder of Boy Found in Box

Philadelphia cold case finally yields identity after decades of mystery

🇺🇸 American

Published June 6, 2025

A cardboard box lies abandoned in a cold field in Philadelphia, reminiscent of where Joseph Augustus Zarelli, the "Boy in the Box," was discovered, central to a decades-long unsolved mystery.
EVIDENCE

Case Details

Quick Facts

Case Status
Solved
Location
Fox Chase neighborhood, Philadelphia, Pennsylvania, USA
Gerningsmand
Ukendt
Offer(e)
Joseph Augustus Zarelli
Gerningssted
Philadelphia, Pennsylvania, USA
Dato for forbrydelsen
ca. 22.–25. februar 1957
Forbrydelsestype
Drab
Sagsstatus
Cold case
Dom
Uopklaret
Efterforskningsperiode
1957–igangværende
Nøglepersoner
Philadelphia Police, Frederick Benonis (opdager af lig)
Mediedækning
Kendt som 'Boy in the Box' / 'America's Unknown Child'

Quick facts

LocationFox Chase neighborhood, Philadelphia, Pennsylvania, USA
GerningsmandUkendt
Offer(e)Joseph Augustus Zarelli
Dato for forbrydelsenca. 22.–25. februar 1957

On February 25, 1957, a gruesome discovery shook Philadelphia. The naked, severely bruised body of a small child was found discarded in a cardboard box beside Susquehanna Road. He was approximately four years old. Despite intensive police investigation, the boy would remain unidentified for 65 years—a haunting symbol of one of America's most disturbing unsolved murders.

The victim, born January 13, 1953, became known only as "The Boy in the Box." Medical examination confirmed he had suffered severe violence before his death. Yet without DNA technology or digital databases available in the 1950s and 1960s, investigators hit an insurmountable wall. Decades passed. Leads dried up. The case grew cold.

A 21st-Century Solution

Timeline

13 January 1953

Birth of Joseph Augustus Zarelli

Joseph Augustus Zarelli is born.

25 February 1957

Discovery of the body

The four-year-old boy is found naked and abused in a box on Susquehanna Road in Philadelphia.

1 January 2019

Exhumation of the remains

The remains are exhumed to develop a DNA profile.

8 December 2022

Identification via DNA genealogy

Philadelphia police announce that the boy has been identified as Joseph Augustus Zarelli.

The breakthrough came not from traditional detective work, but from advances in genetic science. In 2019, more than six decades after the boy's burial, authorities exhumed his remains and successfully developed a complete DNA profile. The biological data was then entered into systems designed for a revolutionary forensic technique: genetic genealogy.

Unlike standard DNA databases used primarily in criminal justice, genetic genealogy works by comparing a victim's or suspect's DNA against voluntary ancestry databases maintained by genealogy companies. These public databases contain millions of genetic profiles uploaded by people researching their family trees. By identifying familial matches—sometimes distant cousins or relatives—investigators can reconstruct family relationships and pinpoint an individual's identity with remarkable precision.

On December 8, 2022, Philadelphia Police announced the identification: Joseph Augustus Zarelli. The genetic genealogy team had traced his maternal and paternal lineages, ultimately confirming his identity through living relatives on both sides of his family.

A Victory Without Justice

The identification marked a watershed moment in American cold case investigation. Yet it also carried profound sadness. By the time authorities confirmed Joseph's name, both of his parents had passed away without ever learning what happened to their son. The case remained—and remains—unsolved in terms of criminal prosecution. No suspect has been charged. No one has been convicted of the child's murder.

The case demonstrates the double-edged nature of modern forensic breakthroughs: science can answer the question "who was he?" but cannot necessarily answer "who killed him?"

International Implications

The Boy in the Box case reflects a broader global shift in how law enforcement tackles cold cases. Genetic genealogy has become increasingly significant in countries including the United States, Canada, Australia, and parts of Europe, where privacy regulations allow DNA comparisons against genealogy databases. In Denmark and other Nordic countries, stricter data protection laws and different legal frameworks have limited the use of this technique—though international cooperation on cold cases has expanded.

The Zarelli case has reinvigorated the Philadelphia Police Department's investigation into his death. With an identified victim, law enforcement can now pursue new investigative angles: locating contemporary witnesses, reexamining historical records, and applying modern forensic techniques to existing evidence.

More than 65 years after he was abandoned in that cardboard box, Joseph Augustus Zarelli finally has his name back. Whether his killer will ever face justice remains an open question—one that modern science has brought tantalizingly closer, even if not fully answered.

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