It was Biden/Harris. The officer was turned into a martyr and held up as proof of the brutality of the riots. You can find some examples of such by searching for 'officer killed in capitol riots' on YouTube. For a company that claims to care about misinformation, they're perfectly happy having hundreds of videos up both stating, defacto, that he was killed - and continuing to politicize it.

And while I have become extremely skeptical of the competence of our government and agencies, I can safely assure you they are more than competent enough to at least determine whether somebody was murdered at the Capitol on a given day, or not.