Question: John Surratt was suspected in involvement of the assassination of what president who was killed in April 1865?

full_context: Document 1: Abraham Lincoln (captain): Abraham Lincoln I (May 13, 1744 – May 1786) was the grandfather of the 16th U.S. president, Abraham Lincoln. Lincoln was a military captain during the American Revolution, and a pioneer settler of Kentucky.
Document 2: David Herold: David E. Herold was born in Maryland, the sixth of 11 children of Adam George Herold (June 6, 1803 – October 6, 1864) and Mary Ann Porter (January 8, 1810 – February 16, 1883). Adam and Mary were married on November 9, 1828 in Washington, DC. David was their only son to survive to adulthood. His father Adam was the Chief Clerk of the Naval Storehouse at the Washington Navy Yard for over 20 years. Herold's family was well-off financially and lived in a large brick house at 636 Eighth Street SE in Washington, D.C., near the Washington Navy Yard. David attended Gonzaga College High School, Georgetown College, Charlotte Hall Military Academy (at Charlotte Hall, St. Mary's County, Maryland), and the Rittenhouse Academy. In 1860 Herold received a certificate in pharmacy from Georgetown College. He then worked as a pharmacist's assistant and as a clerk for a doctor, and was an avid hunter. He became acquainted with John Surratt while attending classes at Charlotte Hall Military Academy in the late 1850s. A few years later, in December 1864, Surratt introduced him to John Wilkes Booth.
Document 3: John List: John Emil List (September 17, 1925 – March 21, 2008) was an American multiple murderer and long-time fugitive. On November 9, 1971, he killed his wife, mother, and three children in their home in Westfield, New Jersey, then disappeared. He had planned the murders so meticulously that nearly a month passed before anyone suspected that anything was amiss.
Document 4: Sara Jane Moore: Sara Jane Moore (née Kahn; born February 15, 1930) is an American citizen best known for attempting to assassinate US President Gerald Ford in 1975. She was given a life sentence for the attempted assassination and was released from prison on December 31, 2007, after serving 32 years. Moore and Lynette "Squeaky" Fromme are the only two women to have attempted to assassinate an American president; both of their attempts were on Gerald Ford and both took place in California within three weeks of one another. Mary Surratt, a woman, was convicted as a conspirator in the murder of Abraham Lincoln and hanged.
Document 5: Abraham Lincoln: Abraham Lincoln ( ; February 12, 1809 – April 15, 1865) was an American politician and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through its Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. In doing so, he preserved the Union, paved the way to the abolition of slavery, strengthened the federal government, and modernized the economy.
Document 6: John Surratt: John Harrison Surratt, Jr. (April 13, 1844 – April 21, 1916) was accused of plotting with John Wilkes Booth to kidnap US President Abraham Lincoln and suspected of involvement in the Abraham Lincoln assassination. His mother, Mary Surratt, was convicted of conspiracy and hanged by the US government; she owned the boarding house that the conspirators as a safe house and to plot the scheme.
Document 7: Abraham Lincoln: The Man: Abraham Lincoln: The Man (also called Standing Lincoln) is a larger-than-life size (12 ft ) bronze statue of Abraham Lincoln, the 16th president of the United States. The original statue is in Lincoln Park in Chicago, and several replicas have been installed in other places around the world. Completed by Augustus Saint-Gaudens in 1887, it has been described as the most important sculpture of Lincoln from the 19th century. At the time, the "New York Evening Post" called it "the most important achievement American sculpture has yet produced." Abraham Lincoln II, Lincoln's only grandson, was present, among a crowd of 10,000, at the unveiling. The artist later created the sculpture in Chicago's Grant Park.
Document 8: Mary Surratt: Mary Elizabeth Jenkins Surratt (1820 or May 1823 – July 7, 1865) was an American boarding house owner who was convicted of taking part in the conspiracy to assassinate U.S. President Abraham Lincoln. Sentenced to death, she was hanged and became the first woman executed by the US federal government. She maintained her innocence until her death, and the case against her was and is controversial. Surratt was the mother of John H. Surratt, Jr., who was later tried but was not convicted of involvement in the assassination.
Document 9: Ulysses S. Grant: Ulysses S. Grant, born Hiram Ulysses Grant , (April 27, 1822 – July 23, 1885) was the Commanding General of the United States Army at the end of the American Civil War and later the 18th President of the United States from 1869 to 1877. As Commanding General, Grant worked closely with President Abraham Lincoln to lead the Union Army to victory over the Confederacy in the Civil War. Supported by Congress, Grant implemented Reconstruction, often at odds with President Andrew Johnson. Twice elected president, Grant led the Republicans in their effort to remove the vestiges of Confederate nationalism and slavery, protect African-American citizenship, and support economic prosperity. Although his presidency has often been criticized for multiple administration scandals and for his failure to alleviate the economic depression following the Panic of 1873, he is regarded as a President who performed relatively well in the context of his time and pursued justice for all.
Document 10: Lewis Sheridan Leary: Lewis Sheridan Leary (March 17, 1835 – October 20, 1859), an African-American harnessmaker from Oberlin, Ohio, joined John Brown's unsuccessful raid on Harpers Ferry, where he was killed. He was the first husband of Mary Patterson. By her second marriage to Charles Henry Langston, she became the future maternal grandmother of poet Langston Hughes.
Document 11: Lincoln (film): Lincoln is a 2012 American epic historical drama film directed by Steven Spielberg, starring Daniel Day-Lewis as United States President Abraham Lincoln. The film also features Sally Field, David Strathairn, Joseph Gordon-Levitt, James Spader, Hal Holbrook, and Tommy Lee Jones in supporting performances. The screenplay by Tony Kushner was loosely based on Doris Kearns Goodwin's biography "Team of Rivals: The Political Genius of Abraham Lincoln", and covers the final four months of Lincoln's life, focusing on his efforts in January 1865 to have the Thirteenth Amendment to the United States Constitution passed by the United States House of Representatives.
Document 12: American Civil War: The American Civil War (commonly known as the "Civil War" in the United States) was fought in the United States from 1861 to 1865. The result of a long-standing controversy over slavery, war broke out in April 1861, when Confederates attacked Fort Sumter in South Carolina, shortly after Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States of America, who advocated for states’ rights to perpetual slavery and its expansion in the Americas.
Document 13: Mary E. Surratt Boarding House: The Mary E. Surratt Boarding House in Washington, D.C. was the site of meetings of conspirators to kidnap and subsequently to assassinate U.S. President Abraham Lincoln. It was operated as a boarding house by Mary Surratt from September 1864 to April 1865.
Document 14: Abraham Lincoln Bicentennial Foundation: The Abraham Lincoln Bicentennial Foundation is the successor organization of the U.S. Abraham Lincoln Bicentennial Commission (ALBC), which was created by Congress and the President of the United States to plan the commemoration of Abraham Lincoln’s 200th birthday in 2009. The Abraham Lincoln Bicentennial Commission sunset on April 30, 2010
Document 15: Surratt House Museum: The Surratt House (also known as the Mary Surratt House and the Surratt House Museum) is a historic house and house museum located at 9110 Brandywine Road in Clinton (formerly Surrattsville), Prince George's County, Maryland, United States. The house is named for John and Mary Surratt, who built it in 1852. Mary Surratt was hanged in 1865 for being a co-conspirator in the Abraham Lincoln assassination. It was acquired by the Maryland-National Capital Park and Planning Commission (M-NCPPC) in 1965, restored, and opened to the public as a museum in 1976.
ground_truth: Abraham Lincoln