A key government witness against three former UBS AG municipal-bond executives in a bid-rigging trial was asked today whether he hated one of the men 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 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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