GRAND FORKS, N.D. (AP) — Grand Forks police say the death of a 5-month-old girl has been ruled a homicide.

KFGO radio reports 18-year-old Mason Kamrowski was arrested Friday and charged with murder in the death of Brynley Rymer.

The infant died May 22 at a Fargo hospital, a day after she was brought to a Grand Forks hospital by a caretaker.

Kamrowski is being held in the Grand Forks County jail. Court records do not list an attorney for him.

Police say the investigation remains open.

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Information from: KFGO-AM, http://www.kfgo.com