A Georgia dentist, his wife, and his 15-year-old daughter were found dead in their suburban Atlanta home Sunday afternoon in what police say was a murder-suicide.

Johns Creek police said they responded to the home for a welfare check shortly after 4 p.m. and found James Choi, 52; Muong Choi, 52; and Grace Choi, 15, all dead inside, WAGA reported.

Investigators say they believe James Choi killed his wife and daughter and then himself. They did not say how the victims or the killer died.

“This tragic incident has deeply affected not only the family and neighbors, but our entire community,” Police Chief Mark J. Mitchell said in a statement. “We extend our heartfelt condolences to those impacted and ask that the community keep them in their thoughts during this incredibly difficult time.”

Grace Choi was a sophomore at Mount Pisgah Christian School, which issued a statement asking “for peace and privacy during this difficult period, allowing us to focus on guiding our students and community with passion and care.”

NBC News said that she was a gifted violinist who performed with the True North Symphony at Carnegie Hall in July.

NBC also said that James Choi worked at Highland Dental in Suwanee and that the office declined comment.