"The services of Mr John Dyson have been terminated with immediate effect," the West Indies Cricket Board (WICB) said in a news release. "Assistant coach Mr David Williams will fill this position on a temporary basis."
Williams is to lead the team at the Champions Trophy in South Africa next month while former Test spinner Lance Gibbs will serve as manager.
West Indies start their campaign in the one-day tournament against Pakistan in Johannesburg on September 23.
The 55-year-old Dyson's makeshift team suffered defeat in two Test matches and all three one-day internationals against visiting Bangladesh last month before restoring some pride by winning a Twenty20 game against the same opposition on August 2.
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