How is Reddington connected to Elizabeth Keen?

Raymond Reddington is Keen’s father, however, the Red she knew is not her real father.

The real Reddington was in a relationship with Liz’s mother Katarina Rostova, who was actually a KGB agent on a mission to seduce and enter into a relationship with him. The real Reddington was shot by Elizabeth Keen as a child while he was fighting with her mother.

“The Blacklist” is an American crime thriller television series that originally premiered on NBC on September 23, 2013.

The show follows Raymond “Red” Reddington (played by James Spader), a former U.S. Navy officer turned high-profile criminal who voluntarily surrenders to the FBI after eluding capture for decades.

Elizabeth Keen, a rookie FBI special agent and criminal profiler has her entire life uprooted as Raymond Reddington insists on speaking only to her.

Elizabeth Keen is picked up by the FBI and driven to a black site to meet Reddington who tells the FBI that he has a list of the most dangerous criminals in the world that he has compiled over his criminal career called the “Blacklist” and offers to help the FBI track down and apprehend them in exchange for immunity from prosecution.