He headed a legal department of the state-run agricultural company Suplmsheni from 1977 to 1985 and worked as a manager at the Ministry of Construction of the Georgian SSR from 1985 to 1989.
During the rise of anti-Soviet and independence movement, Omanidze joined the Afghan Union of Georgia, an organization of the Georgian veterans of the Soviet–Afghan War, being its deputy chairman from 1990 to 1991.
During the fighting in Tbilisi, Gamsakhurdia summoned Omanidze to a government house bunker, where he had entrenched himself against the rebel assaults.
In 1996, the Georgian prosecutor’s office issued a warrant for the arrest of Omanidze on charges of illicit financial dealings.
[5] He died on 20 November 2020, from complications of COVID-19 at a Hospital in Saint Petersburg during the COVID-19 pandemic in Russia, where he had lived the last 15 years of his life.