MATTAPAN (CBS) – Police are investigating the death of a woman on Fottler Road in Mattapan on Thursday afternoon.

Police said the woman was found unconscious in the street with head trauma at about 3:20 p.m. By the time police arrived, the woman was dead.

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“On arrival, they observed a female in the street Boston EMS responded and declared that female nonviable. The female was suffering from head trauma,” said Police Superintendent Paul Donovan.

The Collision Investigation Unit and the Homicide Unit are both involved in the investigation.

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“We have some witnesses that we are interviewing,” said Donovan.

Donovan said the police are not calling the case a “hit and run.”

Police have not released the identity of the woman. They are interviewing witnesses and looking for surveillance video that might help them piece together what happened.

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Anyone who has information is asked to call the Boston Police Department.