The head of Epsom College has been found dead along with her husband and seven-year-old daughter in a property on school grounds.
Emma Pattinson, 45, her husband George, 39, and their daughter Lettie, seven, were found dead at 01:10 GMT on Sunday.
Surrey Police said they were called to the property by South East Coast Ambulance Service.
Police said they were confident it was an isolated incident "with no third-party involvement".
An investigation is being carried out to establish the circumstances of their deaths.
Detective Chief Inspector Kimball Edey said: "On behalf of Surrey Police, my team, and I, I first want to express my sincerest condolences to the friends and family of Emma, Lettie and George, as well as to the students and staff of Epsom College, for their tragic loss.
"I want to give my assurance that we will conduct a thorough investigation into what took place last night, and hope to be able to bring some peace in these traumatic circumstances. I would ask that their privacy is respected at this very difficult time."
Ms Pattinson had been in the role at the school for five months.
The prestigious private school was named the best independent school of the year in 2022.
Police said they were confident it was an isolated incident "with no third-party involvement".
An investigation is being carried out to establish the circumstances of their deaths.
Detective Chief Inspector Kimball Edey said: "On behalf of Surrey Police, my team, and I, I first want to express my sincerest condolences to the friends and family of Emma, Lettie and George, as well as to the students and staff of Epsom College, for their tragic loss.
"I want to give my assurance that we will conduct a thorough investigation into what took place last night, and hope to be able to bring some peace in these traumatic circumstances. I would ask that their privacy is respected at this very difficult time."
Ms Pattinson had been in the role at the school for five months.
The prestigious private school was named the best independent school of the year in 2022.
