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News Specialist John Hollenhorst reporting
Detectives have made an arrest in the murder of a young woman whose body was found on fire under Interstate-80.
And the suspect is another woman.
Detectives aren't saying if they believe the motive was jealousy -- the result of a love triangle.
But they confirmed today they've arrested the ex-girlfriend of the murdered woman's boyfriend.
The case has definitely taken some strange and mysterious twists. Among the questions: where was the young victim all day Sunday after she was abducted in a parking lot?
The body was found in a pile of burning debris under Interstate-80 Sunday evening.
Detectives have not revealed how 23-year-old Kellie Nelson was killed, but they believe she was abducted 14 hours before in the driveway lot of her Taylorsville apartment as she left for work.
"I believe she was taken against her will ... and probably held captive for a while," says Salt Lake County sheriff Aaron Kennard.
Detectives arrested 28-year-old Sally Ann Krivanek, a divorced mother of two young children. After the arrest, deputies took her to a hospital because of some minor injuries.
"Indicative of an altercation, struggle, that's correct," Kennard says.
Detectives say Krivanek is the ex-girlfriend of Kellie Nelson's boyfriend. She lives in a house in Salt Lake City and apparently has no criminal record.
Neighbors were shocked by her arrest, and stunned to see her mugshot. They say she's been a very good neighbor, always offering to help.
Neighbors Anna and Christos Tsoufakas say she helped them with chores such as taking out the garbage, and that she was a good mother.
The break in the case came when the sheriff appealed yesterday to a mysterious anonymous tipster. The tipster called back, and it turned out to be Krivanek herself.
"One of the phone calls that we received yesterday we have linked to this young lady. Several of the other phone calls helped us gather additional evidence that we believe has linked her to the crime," Kennard says.
"We believe we have a very strong case against this young lady for being involved in it."
The suspect's two young children are in the custody of their father. He has no other known connection to the case.