Mugshot released of MacArthur BART station stabbing suspect

OAKLAND, Calif. (KGO) -- A booking shot has been released of John Cowell, who was arrested in the deadly stabbing of Nia Wilson at the MacArthur BART station.

VIDEO: 'Remember Her' A tribute to Nia Wilson

Nia Wilson was just 18 years old when she was killed in an unprovoked stabbing at MacArthur BART station in Oakland. Fighting through sorrow, her friends, family, and the community at large are mourning the teenager who brightened the lives of those she knew, and has inspired many who never got the chance.

Cowell, 27, was arrested last night at the Pleasant Hill BART station.

VIDEO: What we know about the deadly Oakland BART stabbing

Here's everything we know about the attack that claimed the life of 18-year-old Nia Wilson.

Police say Nia and her sister Letifah Wilson were stabbed by Cowell at the station on Sunday night. The sisters were on their way home from a family gathering when the attack happened around 9:45 p.m. Letifah suffered injuries to her neck. Letifah said they were blindsided by a maniac that they did not know their attacker.

RELATED: This is the moment the BART stabbing suspect was arrested

John Cowell is accused of killing 18-year-old Nia Wilson and injuring her sister Letifah Wilson at MacArthur BART. He was arrested Monday afternoon at a different BART station in Pleasant Hill.

Investigators are still searching for a motive in the seemingly random attack.

Go here for full coverage on the stabbing at Oakland's MacArthur BART station that took the life of 18-year-old Nia Wilson.

CONTINUING COVERAGE ON DEADLY BART STABBING:

• What we know about deadly stabbing at Oakland's MacArthur BART station
• 'Remember Her' A tribute to Nia Wilson
• Here's how you can help the family of BART stabbing victim Nia Wilson
• Chilling dispatch call describes terrifying fatal MacArthur BART stabbing
• 'He was wiping off his knife': BART stabbing victim recalls horrific attack that killed sister
• Heartbroken father demands justice after daughter stabbed at BART station
• 'Stand down': BART stabbing victim's godfather makes plea to black community
• TIPS: How to stay safe on BART
• Bart releases info on pair of homicides