"There was a conspiracy between Nevzlin and Alexei Pichugin [a Yukos security official who is serving a life sentence] and other unidentified people from the company's management to commit crimes," the court ruling said.
Nevzlin's sentence is expected to be announced at around 5:00 p.m. Moscow time (13:00 GMT) on Friday.
Investigators said that between 1998 and 2002, members of an organized criminal group headed by Nevzlin murdered, among others, Nefteyugansk Mayor Vladimir Petukhov and businesswoman Valentina Korneyeva. Petukhov's widow, Farida Islamova, filed a $23.7 million suit against Nevzlin last month.
Nevzlin, who fled to Israel in 2003 following the arrest of several Yukos officials, including CEO Mikhail Khodorkovsky, denies the charges that he organized 11 murders and attempted murders.
He was charged in absentia and the case against him opened in February. Israel has refused to extradite him, demanding more evidence.
Nevzlin has been also charged with evading taxes and embezzling more than $100 million. The prosecutor has sought life imprisonment for the former Yukos executive.
Once Russia's largest oil producer, Yukos collapsed after charges of tax evasion led to the company being broken up and sold off to meet debts. The bulk of the company's assets were bought up by state-run oil company Rosneft.
Former tycoon Khodorkovsky is now serving an eight-year prison sentence in Siberia for stealing government shares, illegal oil trading, and laundering $25 billion earned from oil sales in 1998-2004.
