Patrol Officer Sean Allen Collier

Patrol Officer Sean Allen Collier

Massachusetts Institute of Technology Police Department, Massachusetts

End of Watch Thursday, April 18, 2013

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Sean Allen Collier

Patrol Officer Sean Collier was shot and killed during a large scale manhunt for suspects in the Boston Marathon bombing.

At approximately 10:30 pm one of the subjects approached Officer Collier as he sat in his patrol car and opened fire on him without warning, striking him several times. The subjects then attempted to steal his service weapon but were thwarted by his level-three holster.

The suspects then carjacked a vehicle and led police on a pursuit while throwing explosive devices at pursuing units. The pursuit ended in Watertown, where one suspect was killed and a Massachusetts Bay Transportation Authority Police Officer was shot and seriously wounded in a gun battle. The second suspect was captured in Watertown the following evening after another shootout.

On April 10, 2014, Police Officer Dennis Simmonds, of the Boston Police Department, died of a brain aneurysm that may have resulted from a head injury he sustained during the shootout with the bombers. He had been struck in the head by shrapnel from a bomb that had been detonated during the shootout.

On April 8th, 2015, the brother who was arrested was convicted of murdering Officer Collier and 29 others counts related to the original bombing.

Officer Collier had served with the Massachusetts Institute of Technology Police Department since January 2012 and had previously worked as a civilian employee of the Somerville Police Department. On August 22nd, 2013, he was posthumously sworn in as a Somerville police officer. He is survived by his parents and five siblings.


  • Age 26
  • Tour 1 year, 3 months
  • Badge 179

Incident Details

  • Cause Gunfire
  • Weapon Handgun
  • Offender 1 shot and killed; 1 convicted of murder


Most Recent Reflection

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Last Sunday, the folks from my shift held a little get together as we sometimes do on holiday weekends after work. It was the 8th anniversary of your murder at the hands of punks who thought they were some kind of heroes. Though we laughed and talked about lots of things, and of course bitched about things at work, we stopped and thought of you and your sacrifice and how close to home it was for us, even those who hadn't started working with us at that time. Not one of us didn't feel a bit emotional at that moment. You ARE a Brother and a neighbor to us and always will be. One of our folks was one of the first on the scene that night. Several of our folks were in Watertown when all Hell broke loose. It was your Brothers and Sisters protecting the future on the Commonwealth's campuses who had to sit behind the State Police at your memorial service to honor you. You got national attention, but not for the right reasons, but even in a nation that now seems so anti-Police it's heart wrenching, cannot find a negative thing to say about you. Thank God you are respected, if only because you were murdered.

Sean, I may never have had the chance to meet you, but I know a number of your co-workers at MIT and some who have moved on for whatever reason, but there is a kinship between our departments that was brought even closer by this horrendous and infuriating tragedy. We will mourn you forever, hero.

In fact it's been eight years, but in all of our hearts, it was last week.

May you continue to forever Rest in Peace, Brother and may God Bless you and all who feel the loss most of all.

Ptl. Jim Leahy, Jr.
Harvard University Police Department

April 23, 2021

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