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St. Paul police say a woman is dead and a man has been jailed in connection with her death.

Police responded just after midnight to an apartment in the 300 block of N. Pierce Street after a 911 call to report a domestic disturbance, said police spokesman Steve Linders.

Officers entered the building near Snelling Avenue and Interstate 94 in the Union Park neighborhood and found a woman unresponsive and “gravely injured,” Linders said.

Linders did not know how the woman was hurt.

Paramedics arrived, but “there was nothing they could do,” Linders said, noting she died at the scene.

A 23-year-old man in the apartment was taken to the hospital for evaluation, and later was booked into the Ramsey County jail on suspicion of murder, Linders said.

A 2-year-old boy, who was also in the apartment, was taken to a hospital for treatment, Linders said.

The three people were known to each other, he said.

The Police Department’s homicide unit is investigating, Linders said.