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An 18-year-old woman found dead Sunday in her Lansing apartment Sunday died from a self-inflicted gunshot wound, the Cook County medical examiner’s office said Friday.

Police responding to the apartment in the 17700 block of Commercial Avenue about 11:15 a.m. Sunday found Summer Mitchell dead and recovered a semi-automatic pistol and a single spent shell casing next to her body.

The medical examiner’s office ruled that Mitchell died from a gunshot wound to the chest and that her death was a suicide, a spokesperson said Friday.