According to police in Baton Rouge, the three attacked Keisha Johnson, 36, because they thought she was firing a gun into the air during a late-night party on April 15.
Police said Johnson actually was picking up people from the party.
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Authorities arrested Derrick Curry, Gregory Parker and Marques Porch Sunday night.
All three are charged with second-degree murder and first-degree feticide.
WBRZ-TV noted it's not clear if anyone else was hurt.
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