NFL Pro Phillip Adams Killed Five, Then Himself: AP

A source said Adams' parents live near the doctor's home in Rock Hill, and that he had been treated by the doctor.

Phillip Adams with the New England Patriots during a game in Orchard Park, New York in 2011.

Photographer: Tom Szczerbowski/Getty Images
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Rock Hill, S.C. (AP) -- Former NFL player Phillip Adams fatally shot five people, including a prominent doctor, his wife and their two grandchildren before killing himself early Thursday.

York County Sheriff Kevin Tolson told a news conference that investigators had not yet determined a motive for Wednesday's mass shooting.