United States Department of the Interior - United States Park Police, U.S. Government
End of Watch Sunday, March 20, 1932
Add to My HeroesWilliam J. Grissam
Private William Grissam was killed while on patrol after his bicycle struck a parked car on John Marshall Place, near Pennsylvania Avenue.
A taxi driver found Private Grissam laying unconscious in the roadway and took him to the Emergency Hospital shortly after 5:00 am. He died at the hospital approximately one hour later.
Private Grissam had served with the United States Park Police for 16 years. He was survived by his wife and two daughters.
Bio
- Age 54
- Tour 16 years
- Badge Not available
Incident Details
- Cause Bicycle accident
- Location District of Columbia
Most Recent Reflection
View all 7 ReflectionsThe proud men and women of the United States Park Police will never forget the ultimate sacrifice of Officer William Grissam and his surviving family. The selfless actions of our Fallen Heroes are the foundation of our core values (Integrity ~ Honor ~ Service). During Police Week, each year, we re-affirm and re-dedicate our commitment by honoring your service, your memory, and your sacrifice.
Chief of Police Rob MacLean
United States Park Police
May 6, 2016
Recent LODD Deaths

Patrol Deputy Antonio Aleman
Doña Ana County Sheriff's Office, NM
EOW: July 8, 2025

Officer Miguel Cano
California Highway Patrol, CA
EOW: July 2, 2025

Deputy Sheriff Devin Mason
Darlington County Sheriff's Office, SC
EOW: July 1, 2025

Detention Officer Francisco Paul Flattes
Cherokee County Sheriff's Office, NC
EOW: June 30, 2025

Police Officer Kelvin Patrick
Detroit Police Department, MI
EOW: February 6, 2025

Supervisory Special Agent Dennis M. Wagner, Jr.
United States Department of Justice - Federal Bureau of Investigation, US
EOW: March 5, 2025

Police Officer Kendall Corder
Milwaukee Police Department, WI
EOW: June 29, 2025

Undersheriff Brandon Gaede
Phillips County Sheriff's Office, KS
EOW: June 27, 2025

Sergeant Shiou Deng
Los Angeles Police Department, CA
EOW: June 23, 2025