This is an update on WTVR regarding the next election potential dates
https://www.wtvr.com/news/virginia-politics/donald-mceachin-died-20-days-after-his-reelection-november-29-2022
"There are several steps that have to be followed before McEachin's seat can be filled.

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First Speaker of the House Nancy Pelosi will have to announce the vacancy

Then Governor Glen Younkin will issue a writ of election. In other words, the governor will order a special election to fill the vacancy.

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That special election generally takes place within 120 days of when the vacancy is announced. If the vacancy were announced today, the deadline to hold the election would be Wednesday, March 29, 2023. The deadline for candidates to file would be 60 days before that."