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Russian investigators summon former oil tycoon's father for questioning in 1998 murder case

FILE - In this file photo taken on Thursday, June 2, 2011, former oil tycoon Mikhail Khodorkovsky's father Boris is seen in a courtroom where his son testifies at Spanish colleague Antonio Valdes-Garciatrial's trial in Moscow, Russia.  The 82-year-old father of former Russian oil tycoon Mikhail Khodorkovsky has been called in for questioning about the 1998 killing of a Siberian mayor. (AP Photo/Alexander Zemlianichenko, file)

FILE - In this file photo taken on Thursday, June 2, 2011, former oil tycoon Mikhail Khodorkovsky's father Boris is seen in a courtroom where his son testifies at Spanish colleague Antonio Valdes-Garciatrial's trial in Moscow, Russia. The 82-year-old father of former Russian oil tycoon Mikhail Khodorkovsky has been called in for questioning about the 1998 killing of a Siberian mayor. (AP Photo/Alexander Zemlianichenko, file)  (The Associated Press)

The 82-year-old father of former Russian oil tycoon Mikhail Khodorkovsky has been called in for questioning about the 1998 killing of a Siberian mayor.

Russian investigators announced in June that they were reopening the investigation of the murder of Nefteyugansk Mayor Vladimir Petukhov and considered Mikhail Khodorkovsky a prime suspect. Khodorkovsky and his associates have denied any involvement in the killing.

Khodorkovsky spent 10 years in prison on charges of tax evasion and embezzlement seen as punishment for challenging President Vladimir Putin's power. Since his 2013 release, he has continued to oppose Putin from exile in Switzerland.

His father's lawyer, Sergei Badamshin, told Russian news agencies Wednesday that Boris Khodorkovsky would appear for questioning on Thursday.