Inspired perhaps by the speculation that JFK Jr. managed to fake his death, an 8chan anon has suggested the possibility that likewise Seth Rich's death was also faked:

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Anonymous 12/04/18 (Tue) 20:49:31 cc8dc3 (1) No.4156464

Been thinking about this for awhile.

What if Seth Rich really isn’t dead? I know it’s far out there, but if all this has been planned for years, surely we could have made it look like he died just the way he was “supposed to”. That would be the ultimate plot twist in this movie.

Like NoName, we have no real proof of knowing he’s actually dead.
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Continuing with the thought, perhaps you remember the 4chan anon who claimed to have been a surgery resident at the hospital where Seth Rich was supposedly brought after having been shot twice. Rich was said to have been conscious and in stable condition and recovery seemed likely. But then he allegedly died under mysterious circumstances. You can read the details here:

http://www.rumormillnews.com/cgi-bin/archive2.cgi/read/75669

So what if the the intel people friendly to candidate Trump knew the importance of Seth Rich and took advantage of this excellent opportunity to fake his death? Wouldn't it be amazing if he suddenly resurfaced, ready to testify?