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Patrol Officer Sean Allen Collier | Massachusetts Institute of Technology Police Department, Massachusetts Massachusetts Institute of Technology Police Department, Massachusetts

Patrol Officer

Sean Allen Collier

Massachusetts Institute of Technology Police Department, Massachusetts

End of Watch: Thursday, April 18, 2013

Bio & Incident Details

Age: 26

Tour: 1 year, 3 months

Badge # 179

Cause: Gunfire

Weapon: Handgun

Offender: 1 shot and killed; 1 convicted of murder

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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.

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Related Line of Duty Deaths

Police Officer Dennis Oliver Simmonds
Boston Police Department, Massachusetts
End of Watch: Thursday, April 10, 2014
Cause: Duty related illness

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We all wear the same uniform no matter what town, city, state or University. It is that bond that binds us all. That Thin Blue Line we all tow together.

It is for that reason I stood proudly that day in Cambridge at MIT with all of our fellow brothers and sisters in blue to honor you at your memorial. We in the Boston area will never forget April 15th or 18th. We will continue to honor those days for years to come.

On behalf of my family, the Brandeis University Police Department and myself, our thoughts and prayers are with you and your family always. Rest in Peace Brother. Thank you for your sacrifice.

Sgt. Dana M. King
Brandeis University Police Waltham, MA
April 18, 2015


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