Authorities say women from two rival groups met up near 29th and Jefferson streets on Monday night.
"It’s chaos, as you could imagine," said Homicide Capt. Jason Smith. "There aren't nearly as many females in the other group — perhaps four to five — so they are certainly out numbered."
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Video shows a woman, who police believe is 19-year-old Tianna Thomas, driving a knife repeatedly into the victim, 23-year-old Shawntae Garrison.
"You can see Ms. Thomas standing on top of her, repeatedly stabbing her," Smith said.
Garrison had several wounds to her chest, back and legs. She later died at Jefferson University Hospital from her injuries.
Police say her 28-year-old sister was critically wounded.
Smith urged Thomas to get a lawyer and turn herself in. As for the other women who were there, he said they're not in the clear either.
"They would be charged with conspiracy and potentially charged with the same offenses: murder, attempted murder, aggravated assault and related offenses," he added. "However, I would surmise that cooperation would go a long way in helping them possibly reduce or avoid those charges."