What to Know John Cowell is accused of fatally stabbing 18-year-old Nia Wilson and wounding her sister at the MacArthur BART station Sunday night. Cowell is slated to be arraigned Wednesday and could be charged with first-degree murder. A motive for the unprovoked attack remains unclear.
The man accused of fatally stabbing an 18-year-old woman in an unprovoked attack at the MacArthur BART station is due to appear in court
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