Lucille has a mental disorder, which stems from her brother's death, which occurred when she was young, and which her father blamed her for, never forgiving her.
While Lucille is telling Angel who her father is, Nadine rolls off the top of the building and kills herself.
Lucille, as Sid, leaves the apartment and starts walking down the road where Steve finds her and picks her up.
Sid later begins to see things as Lucille's personality tries to "retake" her body and mind.
Michelle decides to do some digging during this and calls Sid to tell him that she found some information on the girl he is "seeing".