An Oregon woman accused of plowing her car into a crowd on the Las Vegas Strip, killing one person and injuring dozens, was charged with murder on Tuesday as investigators sought clues to what motivated the rampage.

Lakeisha N. Holloway, 24, who was arrested after the incident on Sunday, has been charged with one count of murder through use of a deadly weapon in the death of a 32-year-old Arizona woman who was in the crowd.

Holloway, due for her first court appearance on Wednesday, was being held in a "medically restricted" jail unit set aside for inmates requiring increased supervision, including those on suicide watch, according to Las Vegas police spokesman Michael Rodriguez.