(Bloomberg) -- A key government witness against three former UBS AG municipal-bond executives in a bid-rigging trial called one of the defendants an "idiot" and was asked today whether he disliked him so much that he put photos of tortured cats on his desk.

Mark Zaino, a former employee on the bond desk at UBS's New York office, told the jury today that while he had joked with one of the defendants, Michael Welty, about cats, he didn't remember placing specific images on Welty's desk.

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