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- Los Angeles is first settled on September 4th.
- The City of Los Angeles is officially incorporated on April 4th.
- The Los Angeles Police Department (LAPD) is formed.
- The Los Angeles Fire Department (LAFD) is established.
- The port city of San Pedro is annexed to the city of Los Angeles. It is where the Coolridge Heist took place.
- (1917) Jack Kelso, former U.S. Marine and District Attorney's Investigator is born.
- Mob gangster Mickey Cohen is born on July 29th in Brooklyn, New York. (born September 4, 1913 in Real-Life)
- (1907) Clinical psychiatrist Harlan Fontaine is born.
- Elsa Lichtmann is born in Germany.
- The U.S. declares war on Germany on April 6th, marking the beginning of U.S. involvment in World War I.
- Herschel Biggs fights with the 1st Battalion, 6th, the 3rd Battalion, 5th, and the 3rd Battalion 6th U.S. Marines on June 6th at the Battle of Belleau Wood in WWI and was heavily traumatized by the event.
- The official armistice is signed on November 11th, marking the end of World War I, also known as the Great War.
- Courtney Sheldon, former U.S. Navy Corpsman and medical student is born.
- Bullocks Wilshire department store opens.
- The New York Stock Market crashes, starting the Great Depression.
- The 4th Street Bridge replaced the last remaining wooden bridge over the Los Angeles River. It exhibits a range of architectural styles, from Beaux Arts in its four concrete towers to Gothic Revival in its porticos, lighting standards and railings.
- Jessica Hamilton is born in Milwaukee, Wisconsin.
- Ford builds the H Boy.
- Michelle Moller is born.
- Cadillac builds the V16 Convertible.
- Chrysler builds the Airflow.
- Duesenberg builds the Walker Coupe.
- The M1 Garand enters service with the United States Infantry.
- The Delage D8-120 sports car is built in France.
- Rust Heinz of the Heinz Food company designed this six passenger coupe as a one-off prototype. It cost an unthinkable $24,000 to produce.
- The International Police Wagon is first built.
- The Keystone Film Company closed down.
- The Japanese attack Pearl Harbor on December 7th.
- The U.S. declares war on Japan on December 8th and war on Germany and the Axis powers soon after.
- The U.S. begin the Okinawa Campaign, also known as the Battle of Okinawa on April 1st, one of the most ferocious battles of the Pacific War in World War II. Cole Phelps is shipped out to the front after attending Officers Candidate School(OCS) back in the U.S.
- The U.S. win the Battle of Okinawa on June 22nd with many casualties. Cole Phelps is awarded the Silver Star, the third highest military decoration that can be awarded to a member of the armed forces, after being found by his superiors and the rest of the 6th Marines to be the only man in his unit to survive the night on Sugarloaf Hill.
- Errol Schroeder buys a Smith & Wesson Model 27 on February 4th.
- Cole Phelps is shipped back home to San Francisco and joins the Los Angeles Police Department in Los Angeles. He starts out on Patrol as a patrolman in Patrol Car 14 Adam with his partner, Officer Ralph Dunn. He is praised by papers as being a hero, since he had fought, serving in World War II and returned home to serve his city as a police officer.
1947 - Present
- January 1: L.A. Noire Begins
- Cole Phelps is promoted to Detective after serving a year on Patrol in Traffic(As his first Traffic case, "The Driver's Seat" takes place in early January, 1947). Cole is then promoted to Homicide, Vice, and later he is demoted to Arson. Phelps is married with two daughters and lives near Hollywood. He has an affair with singer Elsa Lichtmann and moves in with her, divorcing his wife, causing a scandal and his demotion from Vice to Arson. Soon after catching and killing the Black Dahlia killer and uncovering the giant Suburban Redevelopment Fund and Elysian Fields Development scandal, Phelps is killed in the line of duty after being swept away by swelling rain water of the Los Angeles River's Tunnel System, after saving U.S. Marine comrade, Jack Kelso, and Elsa.
- Stefan Bekowsky is promoted to Homicide.
- Courtney Sheldon is killed by Harlan Fontaine.
- Harlan Fontaine is killed by Ira Hogeboom.
- Former Marine Ira Hogeboom is killed by Jack Kelso.
- Elizabeth Short, Celine Henry, Deidre Moller, Antonia Maldonado, Theresa Taraldsen, and Evelyn Summers are all murdered by Garrett Mason.