1979 Cold Case Victim Identified as Robert Dean Irelan Using Genetic Genealogy

Apr 24, 2026, 13:42

Introduction

A murder case from 1979 in Salem County, New Jersey, has been solved. The victim has been identified as Robert Dean Irelan, thanks to genetic genealogy research carried out by Ramapo College.

Main Body

The remains of a person were found in a shallow grave in a wooded area of Quinton Township, about 41 miles from Philadelphia. The New Jersey State Police determined that the victim died from a gunshot wound to the head during the winter of 1978–1979. For decades, the case remained unsolved, and the victim was known only as John Doe. In March 2023, the investigation was reopened. Researchers at the Ramapo College Investigative Genetic Genealogy Center used DNA technology to build a family tree of the victim''s relatives. Tracie Boyle, a case manager at the center, stated that the team used match lists from Match List Pro and Family Tree DNA to find genetic relatives and search for common ancestors. The investigation focused on connections to the Atlantic City area because the victim was known to spend time there. As a result, the victim was identified as Robert Dean Irelan, a resident of Pleasantville, New Jersey, who often visited Atlantic City. Investigators believe Irelan was in his late teens or early twenties when he died. At the time of discovery, Irelan was wearing white painter’s trousers, a plaid cotton shirt, Pro-Keds sneakers, a black-and-white pullover sweater, and a distinctive blue Lee jacket. The jacket had a gold-plated letter ''R'' on the right pocket flap and a small gold-plated cross on the left pocket flap. Before the identification, law enforcement released a drawing of the victim''s face. A later photograph of Irelan matched that drawing. The New Jersey State Police have interviewed Irelan’s family and are asking the public for any information that could lead to the person responsible for the murder. Boyle expressed hope that community members would provide details to help the investigation. Herbert Ladner, a local resident who remembered the case from when it first appeared in the news, commented that advances in genetic technology could help reduce crime and assist those handling such cases.

Conclusion

Authorities are still asking the public for information about the killer. The identification of the victim gives investigators a starting point for further work.

Vocabulary Learning

advances
Progress or improvements in a particular field or activity.進步，進展
Example:Advances in genetic technology could help reduce crime.
distinctive
Having a quality that makes something easy to recognize; unique.獨特的，與眾不同的
Example:The victim was wearing a distinctive blue Lee jacket.
lead to
To cause something to happen or result in something.導致
Example:Any information that could lead to the person responsible for the murder.
reopened
Opened again after being closed, especially an investigation or case.重新開啟的
Example:In March 2023, the investigation was reopened.
unsolved
Not yet resolved or explained; still without a solution.未解決的
Example:For decades, the case remained unsolved.

Sentence Learning

The victim has been identified as Robert Dean Irelan, thanks to genetic genealogy research carried out by Ramapo College.
Passive voice in present perfect ("has been identified") emphasizes the action on the victim. The phrase "carried out by" is a reduced relative clause (research that was carried out), making the sentence concise.被動語態（現在完成式「has been identified」）強調受害者被確認身份。短語「carried out by」是省略關係代詞的關係子句（即 research that was carried out），使句子更簡潔。
For decades, the case remained unsolved, and the victim was known only as John Doe.
Passive voice ("was known") shows the victim's unknown status. The time phrase "for decades" sets the duration, and "and" connects two related facts.被動語態（「was known」）表示受害者身份不明。時間短語「For decades」說明持續時間，而「and」連接兩個相關事實。
As a result, the victim was identified as Robert Dean Irelan, a resident of Pleasantville, New Jersey, who often visited Atlantic City.
Passive voice ("was identified") reports the outcome. "As a result" is a linking phrase showing cause and effect. The relative clause "who often visited" gives extra information about the victim.被動語態（「was identified」）報告結果。「As a result」是連接短語，表示因果關係。關係子句「who often visited」提供關於受害者的額外信息。
The New Jersey State Police have interviewed Irelan’s family and are asking the public for any information that could lead to the person responsible for the murder.
The relative clause "that could lead" defines the type of information. The sentence uses present perfect ("have interviewed") and present continuous ("are asking") to show ongoing actions.關係子句「that could lead」定義了信息的類型。句子使用現在完成式（「have interviewed」）和現在進行式（「are asking」）表示正在進行的行動。
Herbert Ladner, a local resident who remembered the case from when it first appeared in the news, commented that advances in genetic technology could help reduce crime and assist those handling such cases.
The relative clause "who remembered" modifies "a local resident". The appositive phrase "a local resident" provides identification. The "that" clause reports his comment.關係子句「who remembered」修飾「a local resident」。同位語短語「a local resident」提供身份說明。「that」子句報告他的評論。