https://www.insider.com/capitol-rioters-who-pleaded-guilty-updated-list-2021-5
Jon Schaffer, the guitarist and founder of the metal band "Iced Earth", was the first insurrectionist to file a guilty plea and agreed to cooperate with prosecutors, according to DOJ filings. Schaffer is also a member of the Oath Keepers militia, who court records reveal planned and practiced their attack on the Capitol weeks in advance.
This table includes the names, accepted charges, and links to court documents of all the people who have pleaded guilty so far. We'll keep it updated as more names are released.