Short answers, pulled from the story.
John Wilkes Booth, an actor and Confederate sympathizer, shot Abraham Lincoln at Ford's Theatre on the 14th of April 1865. Booth hoped that killing Lincoln, along with Secretary of State William H. Seward and Vice President Andrew Johnson simultaneously, would revive the collapsing Confederate cause. He had also been enraged by Lincoln's April 11 speech promoting voting rights for emancipated slaves.
Abraham Lincoln was shot at Ford's Theatre in Washington, D.C., while watching a performance of Our American Cousin. He was taken across the street to the Petersen House, where he died at 7:22 am on the 15th of April 1865.
Lincoln was accompanied in the Presidential Box by his wife Mary Todd Lincoln, Major Henry Rathbone, and Rathbone's fiancee Clara Harris. General Ulysses S. Grant had originally been invited but declined because Mary Lincoln and Julia Grant were not on good terms.
Booth fled into Maryland, crossing the Navy Yard Bridge that night, and later rode with David Herold to the farm of Samuel Mudd, who splinted Booth's broken leg. After hiding in Zekiah Swamp for five days, Booth was located at a tobacco farm in King George County, Virginia, on the 26th of April 1865. He was shot by Sergeant Boston Corbett and died on the porch of the Garrett farm, speaking his last words, "Useless... useless."
Booth originally planned to kidnap Lincoln, not kill him, in order to force the Union to resume prisoner exchanges with the Confederacy. After that plan collapsed in March 1865 and the Confederacy began to fall, Booth shifted to a coordinated assassination plot targeting Lincoln, Secretary of State Seward, and Vice President Johnson, all to be struck simultaneously on the night of the 14th of April 1865.
Lewis Powell, David Herold, George Atzerodt, and Mary Surratt were hanged at the Old Arsenal Penitentiary on the 7th of July 1865; Mary Surratt was the first woman executed by the United States government. Samuel Mudd, Samuel Arnold, and Michael O'Laughlen received life sentences. John Surratt fled to Europe and the Papal States but was captured in Egypt in November 1866; his 1867 civil trial ended in a mistrial and he was never retried.