19 April 1561

A series of attacks in Nova Scotia, Canada, ended when the perpetrator was killed by police, leaving 22 victims dead.

Freddie Gray, a 25-year-old African American, died of injuries sustained while in the custody of the Baltimore Police Department.

Joseph Alois Ratzinger was elected Pope Benedict XVI on the second day of the papal conclave.

Air Philippines Flight 541 crashed in Samal, Davao del Norte, killing all 131 people on board.

A truck bombing destroyed much of the Alfred P. Murrah Federal Building (aftermath pictured) in Oklahoma City, killing 168 people and injuring more than 680 others.

A gun turret exploded on board the United States Navy battleship Iowa, killing 47 sailors.

The fictional Simpson family made their first appearance in the short "Good Night", aired in a segment of the The Tracey Ullman Show.

"Advance Australia Fair", written by Scottish-born composer Peter Dodds McCormick, officially replaced "God Save the Queen" as Australia's national anthem.

Aryabhata (pictured), India's first satellite, was launched from Kapustin Yar in the Soviet Union.

Salyut 1, the first space station, was launched from the Baikonur Cosmodrome near Tyuratam in the Soviet Union.

The Doors (pictured) released L.A. Woman, their final album during their lead vocalist Jim Morrison's lifetime.

American actress Grace Kelly (pictured) became the princess consort of Monaco upon her marriage to Rainier III.

American actress Mae West (pictured) was sentenced to ten days in jail for "corrupting the morals of youth" with her play Sex.

Anti-Jewish riots broke out in Kishinev, the capital of Bessarabia Governorate, causing the death of nearly 50 Jews and focusing worldwide attention on the persecution of Jews in Russia.

The Minute Man was unveiled as part of the centennial celebration of the Battles of Lexington and Concord.

The first bloodshed of the American Civil War took place when Confederate sympathizers in Baltimore, Maryland, attacked members of the Massachusetts militia en route to Washington, D.C.

War of the Fifth Coalition: French general Louis-Nicolas Davout defeated an Austrian force in Lower Bavaria, allowing him to rejoin the main French army.

The States General of the Dutch Republic received John Adams, and the house he had purchased in The Hague became the first United States embassy.

The American Revolutionary War began with the Battles of Lexington and Concord in the British colony of Massachusetts.

The Polish Partition Sejm met to discuss the First Partition of Poland, carried out the previous year by Russia, Prussia and Austria.

With no living male heirs, Charles VI, Holy Roman Emperor, issued the Pragmatic Sanction, allowing the Habsburg hereditary possessions to be inherited by a daughter.

In Lisbon, Portugal, a crowd began a massacre of Jews who had been forced to convert to Christianity.

The Ingenuity helicopter becomes the first aircraft to achieve flight on another planet.

A killing spree in Nova Scotia, Canada, leaves 22 people and the perpetrator dead, making it the deadliest rampage in the country's history.