Police are looking for a man named John Lee Cowell a suspect they say stabbed two women at the MacArthur BART station.
18-year-old Nia Wilson was killed in the attack, which appears to be a random crime.
Police are now actively searching for Cowell & if you see the man you should call 911 or reach out to police's anonymous tipline at 510-464-7011.
Photos below are supplied by BART the most recent one being the one in the hat.
There also will be a vigil held today at MacArthur BART from 4p-7p
Murder suspect identified in MacArthur stabbing. John Cowell is considered dangerous. Please call 911 if spotted. RIP Nia Wilson. We will bring this suspect to justice. Our thoughts are with the family and friends. Details: https://t.co/DEkTJvJnNe pic.twitter.com/igZU2bdel7— SFBART (@SFBART) July 23, 2018