Sergeant Dennis Oliver Simmonds

Sergeant Dennis Oliver Simmonds

Boston Police Department, Massachusetts

End of Watch Thursday, April 10, 2014

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Dennis Oliver Simmonds

Sergeant Dennis Simmonds suffered a fatal brain aneurysm while working out at the Boston Police Academy gym at approximately 1:30 pm.

Officer Simmonds had suffered a head injury April 19th, 2013, when he was struck by shrapnel from an explosive device that was detonated during a shootout with the Boston Marathon Bombers in Watertown, Massachusetts, the day after they murdered Police Officer Sean Collier of the Massachusetts Institute of Technology Police Department.

After he collapsed in the gym he was rushed to a local hospital where he passed away.

Sergeant Simmonds had served with the Boston Police Department for six years. He is survived by his parents.

He was posthumously promoted from officer to sergeant by the Boston Police Department on June 14, 2018.


  • Age 28
  • Tour 6 years
  • Badge Not available

Incident Details

  • Cause Duty related illness
  • Incident Date Friday, April 19, 2013
  • Weapon Explosives; Bomb
  • Offender Not available

PT, terrorism

Most Recent Reflection

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Sergeant Simonds, it has been 10 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 6 years of law enforcement service.

Chief (Ret) Steven Marshall
Georges Mills, NH

April 11, 2024

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