A post mortem found Glushkov died from a compression to the neck - but have not linked the murder to the Salisbury attack.
The 68-year old's death was being investigated by Counter Terror officers due to Mr Glushkov's known associations.
Glushkov was a close associate of Russian oligarch turned Kremlin critic Boris Berezovsky, who died under disputed circumstances in 2013.
Shortly after Berezovsky's death, Glushkov told The Guardian that he was also a target of the Russian government. After Berezovsky's death, an inquest failed to determine whether his death had been caused by suicide or foul play. "Too many deaths [of Russian exiles] have been happening".
Glushkov's death came after the poisoning of former Russian spy Sergei Skripal and his daughter, Yulia, with a military-grade nerve agent in the English city of Salisbury.
For his part, Glushkov spent five years in Russian jail on fraud and money laundering charges.
He served a five-year term for money laundering and fraud in Russian Federation, then fled the country after being handed a two-year suspended sentence for fraud in 2006. In 2004, he was sentenced to three years and three months behind bars but was released in the courtroom having served the term in custody.
He had been expected in commercial court on the morning of his death to defend a claim made against him by Aeroflot.
Glushkov was found dead in his London home on March 12.
Detectives are retaining an open mind and are appealing for any information that will assist the investigation.
"There are no wider public health concerns in relation to this investigation".
A murder investigation was launched Friday into yet another suspicious incident involving yet another Russian exile living in Britain - the latest episode coming just over a week after a former Kremlin spy and his daughter were poisoned.
Mario Kart Google Maps Easter Egg Guides You For Mario Day
Once you tap this, you'll be prompted with "Oh yeah!" The Google Maps-Mario Kart mashup will be available until March 17. However, do be careful not to share any personal information you don't want others to see, such as your home address.
Meghan Markle attends first official event with the Queen
Her new cross bracelet is also believed to be by Birks and is thought to have been created to mark her recent baptism. The most senior members of the Royal family have also reportedly been through similar training exercises in the past.