Family, Friends & Fellow Officers Remember...

Patrolman William F. O'Brien

New York City Police Department, New York

End of Watch Friday, May 2, 1947

Leave a Reflection

Reflections for Patrolman William F. O'Brien

Thinking of you today our dear and beloved Grandfather. You are always in our hearts. We thank you for your service. God bless our NYPD.

K (O'Brien) Mastromatteo

May 2, 2023

Patrolman O’Brien,
On today, the 75th anniversary of your your death I would just like to say thank you for your service and sacrifice for the citizens of New York City. And to your Family and loved ones, I wish to extend my deepest sympathy.


United States Border Patrol

May 2, 2022

Rest easy in heaven

Mark Mottola

May 2, 2020

Thinking of you today. As this crazy world unfolds I become much more proud of my family history.


May 2, 2019

Thinking ofyou on the 70th anniversary. We will never forget


May 2, 2017

Found my Mom,s memorial badge in a drawer, found myself missing her and reflecting on her loss as a young girl. She was always so proud of her father, and rightfully so...Thank you for your sacrifice and legacy.

Edward F. Sheridan
Son of late A.Joy O'Brien, his daughter

February 19, 2017

In loving memory of you, dear Grandfather...forever proud of the NYPD. And giving thanks to God for our Peace Officers; may His protection and grace be upon every one of them...everywhere, we pray.

Katherine O'Brien Mastromatteo

May 4, 2016

Thinking of you today Gandpa.....68 yrs.


May 2, 2015

Watching the two services for the recently murdered officers has brought back painful memories. I never knew my Grandfather but will never forget the fear of my Daddy not coming home. How horrible it must have been for my Grandmother and the children when my Grandfather was killed. My Dad followed in his footsteps. We as a family ALWAYS lived with the fear of him not coming home. My heart is broken for the families.


January 4, 2015

Your heroism and service is honored today on the 65th anniversary of your death. Your memory lives and you continue to inspire. Thank you for your service.

My cherished son Larry Lasater was a fellow police officer who was murdered in the the line of duty on April 24, 2005 while serving as a Pittsburg, CA police officer.

Time never diminishes respect. Your memory will always be honored and revered.

I pray for solace for all that love and remember you for I know both the pain and pride are forever. Thanks to your family for sharing their devotion to you through their reflections.

Rest In Peace.

Phyllis Loya
Mom of fallen California Officer Larry Lasater, Pittsburg PD, eow 4/24/05

May 2, 2012

Dear Grandpa ,
I would have loved to have met you . You would be so proud of your family. Just looking back on how great your sons and daughter where . Hanging out with my uncles ,Billy , Richie and of course my Dad Bob was a gift that I truly miss. thank you for setting the example .

Thomas(Buddy) O'Brien

July 1, 2011

Rest in Peace Patrolmen O'Brien. You are not forgotten today.May God continue to watch over you and your family.


May 2, 2011

I said a little prayer today for Patrolman O'Brien and his family. He may be gone but never forgotten. He will always be a New York HERO.

Robyn Wilkes

April 21, 2009

You are in my thoughts on your 61st. anniversary. Love, RoseAnn


May 3, 2008



May 2, 2008

I remember holding his hat as a child and asking my father about him.I looked at it in awe because there was still some blood stains on the inside of the hat.I knew some of the story of his death and I even saw pictures of his funeral. May 2nd now holds new meaning for me and feelings only a child of a cop could feel and understand. I wish I knew him. RoseAnn O'Brien Sachs


April 22, 2008

Dearest Grandfather,
I never had the opportunity to know you...yet grandma "O'B" always reminded us as to what a great, loving & devoted husband & father you were. You loved the force & guarded many with your selflessness. Our dad, your first son, William J, walked in your shoes as he too gladly became an NYPD officer. How proud of you & him & the force our family still may be a lifetime ago, but you are still in my heart.
In remembrance of your life given on 5/2/47...
Kathy, your first grandchild.

Katherine (O'Brien) Mastromatteo

April 21, 2008

A dear friend recently lost her Law Enforcement husband. His name was added to a national fallen hero site. I became curious about my Grandfather's death.

I remember hearing stories from my dad, also an NYPD Officer, William Joseph O'Brien. I also remember vividly holding his hat (the uniform hat he was wearing the day he was killed), and wondering, though not understanding at the time, what it must have felt like to die.

I know that my grandfather was an excellent and competitive athlete. He was a gentle yet strong father figure, and his sense of public service was a shining example for those who knew him. I would have loved to have had just an hour to sit and share precious time with this wonderful man, I had never met.

I will always remember and deeply appreciate the sacrifices our Law Enforcement men and women have made. God Bless you Grandpa and Daddy..

Margaret R Chiusano (O'Brien)

April 21, 2008

Thank you for your service.May you Rest in Peace knowing that you have not been forgotten.

May 2, 2006

Patrolman O'Brien,
On today, the 59th anniversary of your death, I would like to say thank you for your service to the citizens of New York City.


May 2, 2006

Want even more control of your Reflection? Create a free ODMP account now for these benefits:

  • Quick access to your heroes
  • Reflections published quicker
  • Save a Reflection signature
  • View, edit or delete any Reflection you've left in the past

Create an account for more options, or use this form to leave a Reflection now.