There were already a range of conspiracy theories swirling around Epstein, ranging from the older style theories about satanic child sacrifice, up to the more modern QAnon theories of a valiant attempt by Trump, et al., to uncover a deep state adrenochrome harvesting operation.
Bot Sentinel reports #ClintonBodyCount and #EpsteinSuicide as trending topics pushed by troll bots.
The Clinton Body Count theory seems most popular
Source: https://twitter.com/Jekklez1980/status/1160222645499113473
Suspicious seems to cross political lines here, with various people speculating that he was killed not by "the Clintons" but by Trump, to help various powerful allies, possibly including Prince Andrew.
Then there's QAnon supporters, who normally laud Trump, who think Trump did it for personal reasons.
Source: https://twitter.com/BryaninSeattle2/status/1160222792228339714
The most obvious explanation is that Epstein killed himself because he was looking at spending the rest of his life in jail as a child sex offender. This leads to a "let it happen" conspiracy theory, where someone arranged for him to not be on suicide watch, knowing he'd tried to kill himself before.
This is very high profile, and will attract a lot of attention. Expect the theories to grow in complexity in the coming months.