LONDON — British police said Tuesday they have opened a homicide investigation after the headteacher of an elite private school was found dead along with her husband and 7-year-old daughter.

Emma Pattison, 45, was found dead alongside her husband George, 39, and daughter Lettie in the early hours of Sunday at their home in the grounds of Epsom College, about 16 miles (26 kilometers) southwest of London.

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