An official autopsy has confirmed that tech mogul John McAfee died by suicide in a Spanish prison cell where he was awaiting extradition to the U.S., El Pais newspaper said on Monday, citing unidentified sources close to the proceedings. 

A spokesperson for Catalonia's court system, which is in charge of the autopsy, did not have any information on the report.

Prison wardens found the body of McAfee hanging in his cell on Wednesday in what appeared to be a suicide, his lawyer Javier Villalba said last week. 

It comes after it emerged that a suicide note was found in the pocket of McAfee when he died.

The revelation was made by an official source familiar with the investigation who told the Associated Press that the note had been found on McAfee at the time of his death.

The source, who was not authorized to speak about the ongoing judicial inquiry, refused to comment on the contents of the note.

Authorities in Spain have previously said everything at the scene in his cell indicated that the 75-year-old did kill himself.

Meanwhile, his widow Janice McAfee, has demanded a 'thorough investigation' of his death, saying her husband did not appear suicidal when they last spoke. 

In her first public remarks since the software entrepreneur's death on Wednesday, Janice said she wanted a 'thorough investigation' to provide 'answers about how this was able to happen.' 

'His last words to me were 'I love you and I will call you in the evening,' the 38-year-old told reporters outside the Brians 2 penitentiary northwest of Barcelona where she recovered her late husband's belongings.