I just can't see why Putin would have him killed. It makes no sense to me, he was already in prison, why make him a martyr now, before elections? As an idea elections in Russia are this month.
We also know Tucker interviewed him shortly before Navalny died and we know that Navalny chose to be in Russia. Maybe CIA wanted to not allow people to process the interview and move to martyr Navalny. There are some spicy stuff in the interview like the US blowing Northstream pipeline and Nazis in Ukraine so who knows.
Every media and politician is 100% sure Putin killed him without even considering any alternative.
My take is that the CIA killed Navalny in order to start unrest before elections or to make sure normies keep funding Ukraine.
I think we simply don't know enough. Putin/Russia could have killed him. They don't seem to give a shit. CIA certainly could have as well, and does seem to benefit more. Could have really been natural causes. Could have been vaccine. Could have been some combination of the lot, where prisoners beat him up of their own volition or something, or some other accident occurred.