VIDEO: 'Remember Her' A tribute to Nia Wilson
Her 18-year-old sister Nia Wilson passed away at the scene. A manhunt was underway on Monday for Cowell. The 27-year-old was arrested in the early evening and was booked on assault with a deadly weapon, violating parole and first degree murder.
"I'm her protector and I feel like I didn't protect her," said Wilson.
"She's just yelling my name, 'Tifah, Tifah, Tifah,' and I said, 'I got you baby, I got you,'" said Wilson as she described the unprovoked stabbing.
RELATED: Here's how you can help the family of BART stabbing victim Nia Wilson
Wilson said she responded by telling her sister she loved her.
"We're gonna get through this, I got you, you're my baby sister," said Wilson.
In describing her sister Nia, she said, "The most sweetest person on the earth, she didn't do nothing to nobody I didn't do nothing to nobody and for this to happen is just outright crazy."
'I feel like I didn't protect her': Oakland BART stabbing victim recalls attack that killed sister
Wilson says she was with two of her sisters, including Nia, heading home from a family function. She says they never saw Cowell or exchanged words with him prior to the stabbing.
"All of a sudden we transfer just to get blindsided by a maniac, for what I don't know," said Wilson.
"I looked back and he was wiping off his knife and stood at the stairs and just looked. From then on I was caring for my sister," continued Wilson.
Wilson says a woman with a stroller that she and her sister had allowed to pass earlier gave her a baby blanket to apply pressure to her sister's neck.
VIDEO: This is the moment the BART stabbing suspect was arrested
Wilson says she was also hurting because Cowell had stabbed her after stabbing Nia.
She says when other BART passengers attempted to stop Cowell, he ran from the scene.
Describing her sister, Wilson said, "That's my heart, she was my heart, no matter our ups and downs we still come back to each other like it was nothing."
She says the family hadn't seen Nia in six months because she was with her mom's side of the family. Wilson also says they rarely took BART.
VIDEO: Heartbroken father demands justice after daughter stabbed at BART station
"As young black women, we shouldn't have to look behind our back you know, we should be living freely like everybody else," said Wilson.
"He just felt upon himself to take his anger or whatever the case may be out on innocent women," Wilson continued.
Nia's nickname according to her family was PG, short for pretty girl. They say she loved to spend lots of time getting ready and doing her makeup.
VIDEO: 'Stand down": BART stabbing victim's godfather makes plea to black community
Wilson says her baby sister wanted to be a lawyer or do something in criminal justice. Also that she wanted to have a dance studio and her own makeup line.
As for her own injuries, Wilson has stitches in her neck.
"Missed the artery, thank God, missed the veins, it's pretty deep and he tried to swing twice hit me in my head, so I have a knot in my head," said Wilson.
Still she's focused on Nia.
"I want justice for my sister," said Wilson.
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