The mother of a young girl known for years as "Precious Doe" pleaded guilty Thursday to second-degree murder in the death of her 3-year-old daughter.

Michelle Johnson, 31, of Muskogee, Okla., also pleaded guilty to child endangerment, abandoning a corpse and tampering with evidence for not helping her 3-year-old daughter as she lay dying after being abused by the girl's stepfather.

Prosecutors said Johnson did not seek help for the girl, Erica Michelle Marie Green, who was dying after being kicked by her stepfather in a Kansas City home.

Johnson's trial had been scheduled to start Jan. 22.