A post mortem has found Charles Kennedy died of a "major haemorrhage" that was "a consequence of his battle with alcoholism", the former Liberal Democrat leader's family said.
They added: "Ultimately this was an illness Charles could not conquer despite all the efforts he and others made."
The family said they had been "touched beyond measure by the outpouring of warmth" from all parts of the country and all sides of politics after 55-year-old Mr Kennedy died suddenly at his home in Fort William on Monday.
The report makes clear this was a consequence of his battle with alcoholism.
We are grateful to the many friends and also medical experts who sought to help down the years but ultimately this was an illness Charles could not conquer despite all the efforts he and others made.
Satirical panel show Have I Got News For You has paid a warm tribute to the late former Lib Dem leader Charles Kennedy.
MPs have paid tribute in the House of Commons to former Lib Dem leader Charles Kennedy, who was found dead at his home earlier this week.
The broadcaster and journalist said he had a 'shared enemy' with the former Lib Dem leader as they bonded over their battle with alcohol.