Question: James Earl Ray, was a convicted murderer who assassinated James Earl Ray, was a convicted murderer assassinated Martin Luther King Jr., an American Baptist minister and activist who became the most visible spokesperson and leader in the Civil Rights Movement, on which date, in Memphis, Tennessee? 

Context paragraphs:
Assassination of Martin Luther King Jr.: Martin Luther King Jr., American clergyman and civil rights leader, was fatally shot at the Lorraine Motel in Memphis, Tennessee, on April 4, 1968.  King was rushed to St. Joseph's Hospital, where he was pronounced dead at 7:05 p.m. that evening.  He was a prominent leader of the Civil Rights Movement and Nobel Peace Prize laureate who was known for his use of nonviolence and civil disobedience.

Martin Luther King Sr.: Martin Luther King Sr. (born Michael King; December 19, 1899November 11, 1984), was an American Baptist pastor, missionary, and an early figure in the Civil Rights Movement.  He was the father of civil rights leader Martin Luther King Jr.

Jack Kershaw: John Karl "Jack" Kershaw (October 12, 1913 – September 7, 2010) was an American attorney best known for challenging the official account of the assassination of Martin Luther King, Jr., claiming that his client James Earl Ray was an unwitting participant in a ploy devised by a mystery man named Raul to kill the civil rights leader.  Kershaw was also a Southern secessionist and segregationist who helped found the League of the South.  In 1998, he sculpted a Nathan Bedford Forrest Statue that has drawn wide criticism and mocking by national media.

Martin Luther King Jr. National Historic Site: The Martin Luther King Jr.  National Historic Site consists of several buildings including Martin Luther King Jr.'s boyhood home and the original Ebenezer Baptist Church, the church where King was baptized and both his father Martin Luther King Sr. and he were pastors.  These places, critical to the interpretation of the life of Martin Luther King Jr. and his legacy as a leader of the American Civil Rights Movement, were included in the National Historic Site when it was established on October 10, 1980.

King Kennedy: King Kennedy is an upcoming drama thriller film set in the 1960s made entirely from archive material.  The film stars some of the most prominent characters from 1960s America, including US President John F. Kennedy, Robert F. Kennedy, the civil rights movement leader Martin Luther King, convicted assassins Lee Harvey Oswald and Sirhan Sirhan and the film world's brightest icons of that time Marilyn Monroe and Frank Sinatra.  The plot line revolves around the concepts of truth and freedom, but pursues further towards deception, intrigue, conspiracy and murder, and features some of the most memorable moments in 1960s America, including Marilyn Monroe's world-famous "Happy Birthday, Mr. President" at Madison Square Garden and Martin Luther King's "I Have A Dream" speech on the steps of the Lincoln Memorial in which he called for racial equality and an end to discrimination.  The film is designed primarily to remind, focusing on the characters and events that build up to the assassinations of John F. Kennedy, Robert F. Kennedy and Martin Luther King as their apparent determination to shy away from war, discrimination and hatred became ever more publicized.

Loyd Jowers: Loyd Jowers (November 20, 1926May 20, 2000) was the owner of Jim's Grill, a restaurant near the Lorraine Motel in Memphis, Tennessee, where Dr. Martin Luther King Jr. was assassinated on April 4, 1968.  In 1993, Jowers appeared on ABC's "Prime Time Live" and related the details of an alleged conspiracy involving the Mafia and the U.S. government to kill King.  According to Jowers, the perpetrator, James Earl Ray, was a scapegoat, and was not directly responsible for the assassination.  Jowers said that he hired Memphis police Lieutenant Earl Clark to fire the fatal shot.  The existence of such a conspiracy, and Jowers' involvement, was supported in the verdict of a 1998 court case which was brought against Jowers by the King family.  The allegations and the finding of the Memphis jury were later rejected by the United States Department of Justice in 2000 due to lack of evidence.

A. D. King: Alfred Daniel Williams King (July 30, 1930 – July 21, 1969), known as A. D. King, was the younger brother of Martin Luther King, Jr., a famed leader of the Civil Rights Movement.  A. D. King was a Baptist minister and a civil rights activist.

Martin Luther King Jr.: Martin Luther King Jr. (born Michael King Jr., January 15, 1929 – April 4, 1968) was an American Baptist minister and activist who became the most visible spokesperson and leader in the Civil Rights Movement.  He is best known for his role in the advancement of civil rights using the tactics of nonviolence and civil disobedience based on his Christian beliefs and inspired by the nonviolent activism of Mahatma Gandhi.

Gerald Posner: Gerald Leo Posner (born May 20, 1954) is an American investigative journalist and author of twelve books, including "Case Closed: Lee Harvey Oswald and the Assassination of JFK" (1993), which explores the John F. Kennedy assassination, and "Killing the Dream: James Earl Ray and the Assassination of Martin Luther King, Jr." (1998), about the assassination of Martin Luther King, Jr. A plagiarism scandal involving his articles and books arose in 2010.  In 2015, the "Chicago Tribune" called Posner "a merciless pitbull of an investigator."

James Earl Ray: James Earl Ray (March 10, 1928 – April 23, 1998) was a convicted murderer who assassinated Martin Luther King Jr. on April 4, 1968 in Memphis, Tennessee.  Ray was convicted on his 41st birthday after entering a guilty plea to forgo a jury trial.  Had he been found guilty by jury trial, he would have been eligible for the death penalty.

Supporting paragraphs: James Earl Ray Martin Luther King Jr.
Answer: April 4, 1968