Susannah Dean

Susannah Dean

Odetta Holmes is the only child of Dan and Alice Holmes, a wealthy black couple, living in New York City.
At the age of five, Odetta falls into a coma when a sociopath named Jack Mort dropped a brick onto her head from the top of a building. Out of this traumatizing incident, Odetta's damaged mind creates a completely separate personality named Detta Walker.
The disparity between Odetta's two personalities approaches the level of polar opposites. Odetta is a refined, morally righteous intellectual who participates in civil rights protests, while Detta is a violent, base individual ruled by sexual desire and fueled by hatred towards the white people Odetta passively resists. The two personalities are completely unaware of each other's existence.
In an ironic twist of fate, Jack Mort (presumably, though never explicitly stated, unaware of the coincidence) attempts to kill Odetta again 20 years later by pushing her in front of the A-train at Christopher Street station. At the last second a man pulls her out of the way, though her legs are severed by the train, restricting her to a wheelchair for the rest of her life.
It is at this point that the Detta Walker personality begins to assert more control over their shared mind. For the three years following the loss of her legs, Odetta experiences blackouts which her intellect fills in with fictional events. Detta, too, suffers the same effects when not in control and realizes periods of time are missing, though she chooses to ignore this. This behavior persists until Roland Deschain "draws" Odetta/Detta into Mid-World from New York City in 1964.
She eventually finds friendship and love in Eddie Dean, another person drawn from her world; however, the relationship is restricted by Detta's personality.
Detta takes over and escapes when Roland travels through the third door into the mind of Jack Mort. Eddie is left alone in the darkness with Detta, who intends to murder him and Roland. She eventually holds Eddie up with Roland's gun and ties him up in ropes. She leaves him on the beach to get eaten by 'lobstrosities', a deadly lobster-like species.
Roland (in Mort's body in Detta's world) realizes a way to save Odetta's life, and brings Mort down to a subway station. He then calls for both Odetta and Detta to look into the doorway out of Mort's eyes. When Detta and Odetta both look out the doorway, they see each other for the first time and both have combined memories of Mort dropping the brick on their head and then being pushed in front of the train. This has the effect of blending the personalities together, creating Susannah Dean (Susannah because it was the middle name of both Detta and Odetta, and Dean because she is married to Eddie by ka).
Throughout the rest of the series, Susannah remains Eddie's lifelong love and one of Roland's faithful companions. Being a merging of the "good" Odetta and the "bad" Detta, Susannah seems closer to Odetta, and this "part" of her former personalities never reappears in the novel; on the other hand, Detta is often called to the rescue when Susannah needs to be a little tougher to deal with evil powers such as the demon of the speaking ring in The Waste Lands or Mia in Song of Susannah.
At the end of the last novel, The Dark Tower, Patrick Danville draws Susannah a door to "happiness" and she travels through it. She ends up in a version of New York, meeting what appears to be Eddie Dean and Jake Chambers (now as brothers and with the last name of "Toren"). Eddie confides in her that he and Jake had each dreamed of her, and that he believes he is falling in love with her.
She is the only member of Roland's ka-tet not to have died at some point throughout the series.