August 21, 2025 — Website Update
Welcome to the updated MASSKILLERS archive. Here you’ll find information, analysis, and history about some of the most infamous cases.

WHAT IS A MASS KILLER?
A mass killer is an individual who perpetrates an act of extreme violence by intentionally and lethally attacking multiple victims in a single incident or closely connected series of events, typically within a limited time frame and geographic area.
EXAMPLES OF INFAMOUS MASS KILLERS
TIMOTHY MCVEIGH

ABOUT THE CRIME:
KILL COUNT: 168 PEOPLE
AGE: 26
METHOD: TRUCK BOMB
Timothy McVeigh (1968–2001) was an American domestic terrorist responsible for the 1995 Oklahoma City bombing, which killed 168 people and injured over 600. A Gulf War veteran, he became deeply anti-government, influenced by events like the Waco Siege and Ruby Ridge. McVeigh carried out the attack with explosives in a truck parked outside the Alfred P. Murrah Federal Building in Oklahoma City, aiming to retaliate against federal authority. Arrested shortly afterward, he was convicted on multiple federal charges and executed by lethal injection in 2001. His actions remain one of the deadliest acts of domestic terrorism in U.S. history.
ADAM LANZA

ABOUT THE CRIME:
KILL COUNT: 27 PEOPLE
AGE: 20
METHOD: SHOOTING
Timothy McVeigh (1968–2001) was an American domestic terrorist responsible for the 1995 Oklahoma City bombing, which killed 168 people and injured over 600. A Gulf War veteran, he became deeply anti-government, influenced by events like the Waco Siege and Ruby Ridge. McVeigh carried out the attack with explosives in a truck parked outside the Alfred P. Murrah Federal Building in Oklahoma City, aiming to retaliate against federal authority. Arrested shortly afterward, he was convicted on multiple federal charges and executed by lethal injection in 2001. His actions remain one of the deadliest acts of domestic terrorism in U.S. history.
CHARLES WHITMAN

ABOUT THE CRIME:
KILL COUNT: 17 PEOPLE
AGE: 25
METHOD: SHOOTING
Charles Whitman was a 25-year-old former U.S. Marine and engineering student at the University of Texas at Austin who became infamous for committing one of the deadliest mass shootings in American history. On August 1, 1966, after murdering his wife and mother earlier that day, Whitman climbed to the observation deck of the university’s clock tower, armed with multiple firearms. From there, he opened fire on people below for over an hour, killing 14 and wounding more than 30 before police officers shot and killed him. The attack shocked the nation and is often cited as one of the first widely publicized mass shootings in modern U.S. history. An autopsy later revealed that Whitman had a brain tumor, though its role in his actions remains debated.