A man has been arrested for fatally stabbing a woman and wounding another on a California train, in what appeared to be a random attack, officials say.
Police on Monday identified John Lee Cowell, 27, who is homeless, as a suspect in the attack, KNTV reported.
Violence on Bay Area Rapid Transit has resulted in three homicides over the last week including the fatal stabbing of the 18-year-old woman Sunday night.
Video surveillance indicates that Cowell allegedly entered the parking structure at the station and discarded his clothes.
Rojas also said that the attack "was, in my close to 30 years of police experience, probably one of the most vicious attacks that I've seen".
Surveillance video on the train and at the station's platform showed Cowell had been riding the same vehicle as the sisters on Sunday, but they did not interact, Rojas said. Police said Cowell stabbed her and 26-year-old Latifah Wilson, who survived.
Nia's sister, Letifah, described her younger sibling as "the most sweetest person on the earth" and reiterated that "she didn't do nothing to nobody" to provoke the attack.
Cowell - who police described as having a "violent past" - has previously been convicted of second-degree robbery, battery, being under the influence of a controlled substance, vandalism and petty theft.
Beilal Chatila, an Oakland-based lawyer, said he was disappointed how some media outlets portrayed Wilson, referring to an image showing her posing with a gun-shaped phone case instead of all the other pictures "they could have chosen from".
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BART has been trying "really hard" to reassure riders that BART is safe and that the organization is working its hardest to make improvements, Rojas said at the press conference.
Her mother, Alicia Grayson, said Wilson took CPR classes and once saved her aunt's life using the Heimlich maneuver.
The attack occurred around 9:45 p.m. on Sunday evening.
Sadly, Nia was killed in the attack.
Nia Wilson and her two sisters were traveling on BART Sunday night when they stopped to help a woman struggling with a stroller exit a train. "And we need the community", Allums said. Wilson died at the station and her sister was taken to the hospital.
On Monday evening, marchers held a vigil for Wilson that brought almost 1,000 people to downtown Oakland, according to an estimate by the Oakland police. "They asked him what his name was".
The family has received an outpouring of support in Oakland and on the internet. She says he's lived in and out of this Concord home and over the years has been in trouble with the law. He had also been hit with multiple restraining orders, including one obtained by a hospital in Richmond who told authorities in 2016 that Cowell had threatened workers "with physical harm". BART Police says it has ramped up patrols and working video cameras have been placed throughout stations and on the cars. He was apprehended on Monday night (July 23) on a train after an anonymous tipster contacted the authorities, and he remains in police custody.