He did flee to California, and only testified after being threatened with jail time.
He had a right to fear being shot, he already had been shot before. He was worried the previous shooter would come looking for him, not the police.
Do you have evidence they were 'complete strangers'?
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Oh, evidence, what is it? What counts as evidence and what doesn't? Claims and theories made up by people with no connection to the case? Evidence gathered by police.....oh no, we can't use that because some individuals (a few, a couple, one?) within the department of over 3000 officers nearly 20 years ago (who, hopefully don't work there anymore), faked evidence, we can dismiss any and all future evidence. There can be good officers within a department that historically has had some problems, and there can be bad officers in a department that has never previously had a big scandal.
So much for this case being 'filed away in a drawer and forgotten'. They do their job and still are accused of being evil. Thankfully, Brown's killers were caught from the tips that pored in, and these tipsters were not from the "Don't help the police" crowd.