Shai Hope hit the winning six as the West Indies bounced back from defeat earlier in the week to beat England by four wickets in Trinidad on Thursday and took a 3-2 victory in the T20 International (T20I) series.
The hosts went into the last over chasing nine runs. Jason Holder secured three off Chris Woakes' first delivery and Hope then smashed the rest off the next ball at the Brian Lara Cricket Academy in Tarouba.
Sam Curran had given England a chance in the previous over, giving away only two runs and taking a wicket.
"It was closer than we thought at the end today, yes. We kept losing key wickets but we always knew Shai Hope was going to be the important man on this pitch," said West Indies captain Rovman Powell.
The victory with four balls to spare completed a hat-trick of T20I series wins for West Indies in 2023 after beating South Africa away and India at home.
Hope was the top scorer in the match with 43 off 43 balls.
England were all out for 132 with three deliveries to spare after a late collapse to some stunning bowling and fielding by the home side.
Opener Phil Salt, who smashed 119 off 57 balls at the same ground on Tuesday to square the series, was bowled by man-of-the-match Gudakesh Motie (3/24) for a top score of 38 immediately after hitting a six as the visitors slumped to 60/3.
Buttler had already gone for 11, caught by Oshane Thomas off Holder.
Salt's score took his series tally to 331 runs from five innings but England's batting lacked the heft of the previous match in which they belted 19 sixes on the way to a total of 267/3.
England were 109/4 after 14 overs but then slumped as the West Indies' spinners went to work.
Pacer Andre Russell was on for a hat-trick in the penultimate over when he took Chris Woakes and Rehan Ahmed with successive balls.
"It’s disappointing to come out on the wrong side of it," said Salt.
"It was another good game of cricket tonight and we took it as deep as we could. Shai Hope played a really good knock and I think we will be better off in the coming months for this experience," he added, referring to next year's T20 World Cup.
