He was a close associate of Russian oligarch Boris Berezovsky, who was a friend of murdered spy Alexander Litvinenko.
Police were quick to suggest there is now no evidence to link the death to events in Salisbury, where the former spy Sergei Skripal and his daughter Yulia were poisoned with a weapons-grade nerve agent that was only ever produced in Russian Federation.
According to the Russian Embassy in London, the United Kingdom refused to extradite Glushkov in February 2016 on charges of large-scale fraud and embezzlement during his time as the deputy director of the Russian national airline Aeroflot.
He was jailed in 1999 for five years after being charged with money laundering and fraud. He was sentenced to three years and three months in prison. In 2011, he gave evidence at the court case brought by Berezovsky against fellow oligarch Roman Abramovich, who remained on good terms with the Kremlin.
During the trial he told the court he had been taken "hostage" by Putin's administration, which tried to force Berezovsky to sell his TV station ORT.
In an interview with The Guardian newspaper not long after Berezovsky's death, Glushkov said he believed he was also a target.
"It sounds to me that they believe it was Russian Federation and I would certainly take that finding as fact, " said U.S. President Donald Trump.
News of Glushkov's death comes amid heightened tensions between the London and Moscow over the recent poisoning of a former Russian agent and his daughter.
Mr Berezovsky was found hanged in the bathroom of his Berkshire home in 2013 and an inquest recorded an open verdict. She is reviewing a range of economic and diplomatic measures in retaliation for the assault with what she identified as the military-grade nerve agent Novichok.
"He sometimes came in our shop many years ago, by the triangle, but I don't remember what he looked like".
According to Tass, he received political asylum in the United Kingdom in 2010.
He told reporters on Tuesday that London wants "Russia to declare these programs now".
As the fallout from the Skripal poisoning continued, Britain's media regulator, Ofcom, announced that Kremlin-backed news channel RT could lose its license to broadcast in the UK.
Russian Federation reportedly dismissed the British claims as a "circus show", a "provocation" and "nonsense".
Sergei Skripal, seen in a 2006 photo when he was convicted in Russian Federation for being a British spy.