Jared Lee Loughner, the alleged gunman in last year's mass shooting outside an Arizona supermarket in Tucson that killed six persons and wounded then-U.S. Rep. Gabrielle Giffords, pleaded guilty Tuesday to 19 charges in exchange for the government not seeking the death penalty. Here are the fast facts about the case:

What happened

• January 8, 2011: Six people are killed and 13 wounded at a "Congress on Your Corner" event sponsored by U.S. Rep. Gabrielle Giffords, a Democrat, at a  grocery store. Giffords is shot in the head but survives.
•  January 9, 2011: Suspect Jared Lee Loughner is charged in federal court with five counts: the attempted assassination of a member of Congress; the murders of Gabe Zimmerman and Judge John Roll; and the attempted murders of Pamela Simon and Ron Barber.
•  August 7, 2012: Loughner pleads guilty to 19 charges in exchange for the government not seeking the death penalty.

Jared Lee Loughner

• Born September 10, 1988
• 2006: Loughner drops out of high school after his junior year, reportedly after being hospitalized for alcohol poisoning.
• 2007:  Loughner is arrested for possession of drug paraphernalia, but the charges are dismissed.
• 2007: Loughner meets Giffords at a community event. He develops a fixation on the congresswoman after he is unsatisfied with her answer to his question.
• 2008: Tries to enlist in the Army but is rejected after failing a drug test.
• 2010: Loughner is suspended from Pima Community College after displaying erratic behavior. He is told he can't return to campus unless he presents a doctor's note saying he is not a danger to himself or others. He voluntarily withdraws from the school.

A timeline of events:

• November 30, 2010 - 22-year-old Jared Loughner purchases a 9mm pistol at a Tucson area gun store.
• January 8, 2011 – About two and a half hours before the shootings, he is stopped by an Arizona Game and Fish Department officer for running a red light and is let go with a verbal warning.
• January 8, 2011 – About 30 minutes before the shootings, Loughner takes a cab from a convenience store to the Safeway grocery store where Giffords' event is being held.
• January 8, 2011 – (10:10 a.m.) –  Loughner allegedly opens fire on a crowd of people at the Giffords event. Six people are killed and 13 wounded. As Loughner attempts to reload his pistol, he is tackled and disarmed by several bystanders.
• January 9, 2011 – Loughner is formally charged with five counts in federal court: the attempted assassination of a member of Congress; the murders of Gabe Zimmerman and Judge John Roll; and the attempted murders of Pamela Simon and Ron Barber.
• January 10, 2011 – Loughner faces his first court appearance to formally hear the charges against him.

• January 19, 2011 – A federal grand jury in Arizona indicts Loughner.
• January 24, 2011 – Loughner pleads not guilty to all charges against him.
• February 11, 2011 – Prosecutors file a procedural motion to dismiss two murder charges against Loughner, though they intend to refile the charges under a superseding indictment.
• March 4, 2012 – Federal prosecutors file an additional 49 federal charges against Loughner.
• March 9, 2011 – U.S. District Court Judge Larry Burns enters "not guilty" pleas on behalf of  Loughner on 49 counts, including murder and attempted murder.
• March 22, 2011 –  Burns orders Loughner to undergo a mental evaluation in Springfield, Missouri, no later than April 29.
• May 25, 2011 –  Burns rules that Loughner is not competent to stand trial.
• May 27, 2011 – Loughner arrives at the Medical Center for Federal Prisoners in Springfield, Missouri.
• June 29, 2011 – Burns sides with prison doctors and rejects a motion from defense attorneys to stop Loughner's forced medication.
• July 7, 2011 – Before a federal appeals panel, the defense argues that forcing Loughner to take mind-altering psychotropic drugs violates his rights.
• July 12, 2011 – The federal court rules Loughner has not been convicted of a crime, therefore he has the right to refuse to take anti-psychotic medication.
• July 22, 2011 – A federal appeals panel reverses the July 12 decision and orders that authorities can force Loughner to take anti-psychotic medication. Prosecutors had argued that his mental state is deteriorating and he is suicidal.
• August 31, 2011 – An appeals court in San Francisco hears arguments from Loughner's lawyers to try to end the forcible medication. They argue that criminal defendants have a constitutional right to refuse mental treatment when the government's primary goal is to make suspects competent enough to be convicted and possibly sentenced to death.

• September 28, 2011 – Judge Burns extends Loughner's treatment at a Missouri medical treatment facility for four more months, at which time Loughner's competency will be re-evaluated.
•  January 8, 2012 –  Giffords attends a vigil in Tucson marking the one-year anniversary of the shooting. She leads the crowd of thousands in the Pledge of Allegiance and later lights a memorial candle for the six people killed.
• January 25, 2012 – In front of the U.S. House of Representatives, Giffords resigns from office via statement read by U.S. Debbie Wasserman Schultz.
• August 7, 2012  – Burns determines that Loughner is competent to stand trial in a federal court in Tucson. Loughner pleads guilty to 19 charges in exchange for the government not seeking the death penalty.