Anti-virus software pioneer John McAfee was found dead in a Spanish prison cell on Wednesday.
A post-mortem examination will be carried out to establish the cause of death, which authorities believe was suicide.
The former tech pioneer was no stranger to controversy during his lifetime and was regularly involved in legal issues.
Why was he being held in a Spanish prison?
McAfee’s body was discovered at the Brians 2 prison in north-east Spain, 60 kilometres from Barcelona.
His death came after Spain's National Court cleared his extradition to the US over tax evasion charges in the state of Tennessee.
McAfee was arrested in October at Barcelona’s international airport as he tried to board a flight to Turkey using a British passport.
He had been in jail since then awaiting the outcome of the extradition proceedings.
McAfee, 75, faced a lengthy prison sentence and had said he would die in prison if he was sent to back to the US to face charges.
When did his legal troubles start?
McAfee had been a fugitive since 2019 after a grand jury in Tennessee indicted him on tax-related charges.
Prosecutors argued that McAfee owed the US government $4.2 million in taxes for undeclared income from 2014 to 2018.
The state of Tennessee said he had failed to report income from promoting cryptocurrency, consultation work, public speaking engagements and selling the rights to his life story for a documentary.
McAfee said in 2019 that he had not paid US income taxes for eight years for ideological reasons.
In 2012 he was wanted for questioning in connection with the killing of Gregory Viant Faull, who was shot to death in early November 2012 in Belize, but he was not charged.
A Florida court ordered him in 2019 to pay $25m to Faull's estate in a wrongful death claim, but McAfee refused to pay.
In July of that year he was released from detention in the Dominican Republic after he and five others were suspected of travelling on a yacht carrying weapons and ammunition.
Sinopharm vaccine explained
The Sinopharm vaccine was created using techniques that have been around for decades.
“This is an inactivated vaccine. Simply what it means is that the virus is taken, cultured and inactivated," said Dr Nawal Al Kaabi, chair of the UAE's National Covid-19 Clinical Management Committee.
"What is left is a skeleton of the virus so it looks like a virus, but it is not live."
This is then injected into the body.
"The body will recognise it and form antibodies but because it is inactive, we will need more than one dose. The body will not develop immunity with one dose," she said.
"You have to be exposed more than one time to what we call the antigen."
The vaccine should offer protection for at least months, but no one knows how long beyond that.
Dr Al Kaabi said early vaccine volunteers in China were given shots last spring and still have antibodies today.
“Since it is inactivated, it will not last forever," she said.
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