The Gabby Petito hashtag has been viewed hundreds of millions of times. And as this board alone demonstrates quite well, very few people are anything other than totally convinced of BL's guilt. Dude is screwed no matter what happens.
No one cares about this, of course, because the rights of defendants are near the bottom of things we worry about (which is kinda weird, since it was near the top of the list of things the founders of the country were concerned about. But times have changed). I have to laugh at that quote from the agents saying something like "we're not going to make you into a spectacle, Brian," or something to that effect, when they were trying to convince him to turn himself in (no idea how to find that now, with the volumes and volumes of posts/material that's been written about this case just in the last day or two). That's exactly what's gonna happen. Judging from the public sentiment, he might as well put on a bright red dunce cap and wear a sign around his neck saying, "I'M GUILTY!"