He briefly discussed Jackson missing rehearsals, but has not yet addressed Jackson's appearance in his final days. Payne resumes testifying Tuesday.
Walker said she attributed Jackson's multilayered wardrobe to a personal preference. She said she recalled one incident in which Jackson may have appeared groggy or drugged, but she said she couldn't remember whether she witnessed or heard about it from others on the show.
Walker was the first witness called by AEG in a trial filed by Jackson's mother, Katherine, against the concert promoter. Her suit claims AEG didn't properly investigate the doctor convicted of involuntary manslaughter in Jackson's death and that its executives missed signs that the singer was unprepared for the comeback shows.
AEG denies all wrongdoing, and contends Jackson hid his struggles with prescription drug addiction. Jackson died in June 2009 from an overdose of the anesthetic propofol, which he had been using as a sleep aid.
Previous witnesses have testified that Jackson was shivering, had to be fed by others and appeared unprepared while preparing for the "This Is It" shows.
Walker said she never saw any of that behavior, although she acknowledged that her job was to work with other dancers and not Jackson directly.
"I wasn't looking for things at the time," she said. "I wish I was."
Payne, however, worked with Jackson individually almost every day for the last three months of the singer's life. He ate lunches with Jackson, saying the star's appetite varied daily. The "Thriller" singer was able to perform many of his familiar dance moves, although they had to be modified because the singer was 50 years old and not as limber as he had been decades earlier.
He said Jackson was tired for some of the sessions and that "some days would be better than others."
A medical examiner who conducted Jackson's autopsy testified Tuesday that Jackson was not underweight when he died and appeared to be in excellent health.
Despite testimony from some witnesses that Jackson appeared emaciated, Dr. Christopher Rogers said the singer did not bear the signs of someone who was starving when he died.
Walker and Payne, who have worked with Jackson since the 1990s, were called Monday because they are slated to leave the country for work. The trial is expected to last several more weeks.