There was a brief period where a police officer was reported as having been murdered by rioters at the Capitol [0], and iirc many people on social media conflated his death with footage of a riot officer being struck on the head by a fire hydrant, though I don't believe they were the same man.

An investigation revealed that he'd died of a stroke the day after the riot, and that his death could not be directly connected to the Capitol riot.

[0] https://www.msn.com/en-us/news/world/brian-sicknick-police-o...

[1] https://www.cnn.com/2021/04/19/politics/brian-sicknick-death...