Detective John James Mulligan

Detective John James Mulligan

Boston Police Department, Massachusetts

End of Watch Sunday, September 26, 1993

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John James Mulligan

Detective John Mulligan was shot and killed while working a secondary employment detail. He was shot five times in the face, execution-style, as he sat in his car at a store at 972 American Legion Highway.

After shooting Detective Mulligan, the two subjects stole his service weapon and fled.

Two suspects were arrested and subsequently convicted of first-degree murder and other related charges in 1995. One of the men had his conviction overturned in 2000 and later plead guilty to a reduced charge of manslaughter. In September 2006, that subject admitted to his participation in the execution-style killing of Detective Mulligan.

The second subject also had his first-degree murder conviction overturned on appeal in 2015. The remaining convictions against the man for possessing the murder weapon and Detective Mulligan's service weapon remained unchanged.

Detective Mulligan had served with the Boston Police Department for 27 years. He is survived by his two sons.


  • Age 52
  • Tour 27 years
  • Badge Not available

Incident Details

  • Cause Gunfire
  • Weapon Handgun; .25 caliber
  • Offender Convicted of manslaughter

robbery, secondary employment

Most Recent Reflection

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Officer Mulligan, it has been 30 years since you were taken from us. New England law enforcement has continued to thrive, learn and become safer due to the traditions and sacrifices you, your family, and many others have made for us. Thank you for your law enforcement service.

Chief (Ret) Steven Marshall
Georges Mills, NH

September 26, 2023

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