The trial, which enters its third week Monday, could offer more previously unpublicized insights into Jackson's life and death.
Along with his oldest children Prince and Paris Jackson, his ex-wife and their mother, Debbie Rowe, is scheduled to testify.
Faye's testimony on Friday offered a glimpse at Jackson's relationship with Rowe, suggesting there was romance involved -- or at least jealously.
Faye said that after she was fired from her job during Jackson's "History" tour in 1997, she learned it was because Rowe felt threatened by her relationship with Jackson.
"She was obviously in love with Michael," Faye said. "She had told me for many years that it was her desire to be with him."
Rowe later apologized to her for asking Jackson's manager to let her go, she testified.
"She told me she was jealous of me," Faye said. "She thought that Michael liked me better."