Timeline
Alexander Litvinenko
London radiation case
Nov. 1, 2006: Former Russian spy Alexander Litvinenko meets two Russian men, Andrei Lugovoi and Dmitry Kovtun, at the Pine Bar in the Millennium Hotel for tea. He also meets Italian academic Mario Scaramella at a sushi restaurant. Later that evening, Litvinenko falls ill.
Nov. 4: Litvinenko is admitted to Barnet General Hospital with stomach pains.
Nov. 17: Litvinenko is transferred to the University College Hospital.
Nov. 20: Litvinenko is moved to intensive care.
Nov. 23: Litvinenko dies after suffering a heart attack.
Nov. 24: Polonium-210 is found in Litvinenko's body. Police find traces of the radioactive isotope at the Millennium Hotel, the Itsu sushi restaurant and Litvinenko's home.
Nov. 27: Polonium-210 is found in two other London locations: 25 Grosvenor Street, near the Millennium Hotel and 7 Down Street.
Nov. 29: Traces of a radioactive substance are found on two British Airways planes at Heathrow Airport.
Dec. 1: Scaramella and Litvinenko's wife, Marina, both test positive for polonium-210.
Dec. 5: Traces of polonium-210 are found at Emirates Stadium, where the Arsenal soccer team plays. Ex-KGB agent Vyacheslav Sokolenko attended a game here during his stay at the Millennium Hotel.
Dec. 6: British police say they are treating Litvinenko's death as a murder. Radiation is found at the British embassy in Moscow. Lugovoi visited the embassy a week after Litvinenko's death.
Dec. 7: Litvinenko is buried at Highgate Cemetery in London. All seven employees working at the Pine Bar in the Millennium Hotel on Nov. 1 test positive for low levels of polonium-210.
Dec. 9: Police in Germany report that they have found indications of radiation in the Hamburg apartment of Kovtun's ex-wife and in her mother's home in the town of Haselau, west of Hamburg.
Dec. 10: Two of the 26 police officers involved in the Litvinenko case test positive for low levels of polonium-210.
Dec. 12: Interpol joins the investigation.
May 22, 2007: British prosecutors say they will seek extradition of Russian business man Andrei Lugovoi to charge him with murder in Litvinenko's death.