Key Dates in Law Enforcement History in Which Officers Were Killed in the Line of Duty

Oct. 3, 1929 — Eight correctional officers are killed at Colorado State Penitentiary, the most ever to die in one incident at a correctional institution, according to the National Law Enforcement Officers Memorial Fund.

1930 — The deadliest year in law enforcement history; 282 officers killed.

Jan. 2, 1932 — Six lawmen are killed as they attempted to apprehend two suspects sought in the murder of Greene County Marshal Mark Noe in Missouri. The incident later became known as the Young Brothers Massacre.

1932-1934 — John Dillinger and his associates murdered 10 law enforcement officers, more than any other outlaw.

April 6, 1970 — Four California Highway Patrolmen die in a 4-minute gun battle with two heavily-armed suspects in what later became known as the Newhall Incident.

September 1971 — Seven correctional officers are killed during the riots at the Attica State Prison in upstate New York.

Feb. 28, 1993 — Four Special Agents of the U.S. Bureau of Alcohol, Tobacco and Firearms (ATF) are killed while attempting to execute a search warrant at the Branch Davidian compound in Waco, Texas.

April 19, 1995 — Timothy McVeigh explodes a truck bomb that destroys the Alfred P. Murrah Federal Buidling in Olkahoma City, killing 168 people, including eight federal law enforcement officers.

Sept. 11, 2001 — Seventy-two law enforcement officers die while responding to the terrorist attacks on the United States, the deadliest single day in U.S. law enforcement history.

Nov. 29, 2009 — Four police officers are killed in a Seattle-area coffee shop as they begin their shifts. Suspect Maurice Clemmons, who has a lengthy and violent criminal records, remains on the run.