The deceased have been identified as the headmistress of famous Epsom College, her daughter, and her husband.
At one in the morning today, police were called to the posh Surrey school that costs £42,000.
The bodies of Emma Pattison, 45, her husband George, 39, and their daughter Lettie, 7, were found there.
Police feel that there was no participation from outside parties in this singular event.
Headmistress Emma has been described as a “wonderful teacher” and “delightful” person.
The “traumatic” loss has left the school community in convulsions.
Among the school’s former students are Jeremy Vine and Nicholas Witchell.
“On behalf of Surrey Police, my team, and I, I first want to extend my profound condolences to the friends and family of Emma, Lettie, and George, as well as to the students and staff of Epsom College, for their awful loss,” said Detective Chief Inspector Kimball Edey.
“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.”
Epsom and Ewell’s Borough Commander, Inspector Jon Vale, stated: “We’re aware that this unfortunate incident would have caused concern and upset among the local community.
“While this is believed to be an isolated incident, in the coming days, our local officers will remain in the area to offer reassurance to students, parents, teachers, and the local community.
“I would like to thank the school and the community for their understanding and patience while the investigation continues.”
Dr Alastair Wells, Chair of the Board of Governors at Epsom College, said, “On behalf of everyone at Epsom College, I want to convey our utter shock and disbelief at this tragic news.
“Our immediate thoughts and condolences are with Emma’s family, friends and loved ones, and to the many pupils and colleagues whose lives she enriched throughout her distinguished career.
“Emma was a wonderful teacher, but most of all she was a delightful person.
“In time we will commemorate Emma and her family, in the appropriate way, and in line with the wishes of her family. But for now, we ask that we are all given the time, space and respect we need to come to terms with this tragic loss.”
Emma was appointed the school’s first-ever female head in September last year.
She revealed to pupils in December that the family had bought a labrador, named Bella, to live with them within the school grounds.
She said: “In terms of transition it’s been a really big change for my family. We’ve moved house – we’ve bought a dog.
“I’ve got a new job, my husband has got a new job, that wasn’t meant to happen but it did and my daughter has started a new school so there’s been a lot of change for us as a family.”
