It was hinted in an interview that it was his girlfriend rather than him (the same one who tried to shoot McAfee in the head). I cannot remember where I found the interview, it was somewhere on YouTube. Does anyone have a link to that?
TLDR version: mentally unstable teenage girlfriend described as repeatedly wanting people killed (including - according to both parties - shooting at McAfee at one stage) and explicit statements that she would kill people if they killed her dog or if asked to by McAfee. Neighbour who had complained about McAfee's dogs killed the day after the dogs are reportedly poisoned.
Looks even more unlikely to be coincidence when McAfee later independently asserts that actually he did believe the neighbour had poisoned his dogs shortly before being murdered https://www.reddit.com/r/netsec/comments/3hr9f0/i_am_john_mc...
Reading the descriptions of some of McAfee's other activities, the only real surprise in the whole tale that it took Belize security forces so long to go after him.