Omelchenko died on 25 November 2021, aged 83, after being infected with COVID-19 which caused a lesion of the lungs.

[5] After graduation, Omelchenko worked at Kyivmiskbud, where he rose from worker to director of the plant of reinforced concrete structures.

[5] After 1989, Omelchenko worked in the system of state construction, he was deputy chairman of the executive committee of the Kyiv City Council, and held the position of general director of Kyivrekonstruktsiya.

[6] On recordings, which were termed the "Second Cassette Scandal"[a] and released in early January 2002, Omelchenko demonstrably urged Viktor Yushchenko to have the Yushchenko-led Our Ukraine bloc and the Omelchenko-led Unity bloc oust Viktor Medvedchuk as first vice speaker of the Rada.

[7] Omelchenko was a candidate in the 2004 Ukrainian presidential election, nominated by the Unity Party, which he formerly chaired.

[12] Omelchenko's son, also named Oleksandr, was also a member of the Verkhovna Rada on an Our Ukraine ticket from 2002 until 2007.

[13] His Oleksandr Omelchenko Bloc won only 2.26% of the vote, and no seats in the Kyiv City Council.

[23] In the 2019 Ukrainian parliamentary election, Omelchenko was a candidate of the Unity Party in single-member district No.

[29] On 18 November 2021, Omelchenko was admitted to hospital after being infected with COVID-19 that had caused a lesion of the lungs.