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It took only five hours for a jury to convict a Brooklyn man this month in the high-profile slaying of Karina Vetrano, whose badly beaten body was found partially clothed in a Queens park after she had gone out for a late-afternoon jog.

Then one of the jurors in the case came forward to say he was improperly pressured to convict the defendant, Chanel Lewis, of first-degree murder and sexual abuse. Based on the juror’s sworn statement, Mr. Lewis’s defense lawyers accused other jurors of misconduct and asked the judge to throw out the verdict.

On Monday, the judge rejected the request for a new trial after a highly unusual two-hour hearing in which three jurors testified about their deliberations. “Motion denied,” Justice Michael B. Aloise said, without explaining his reasoning.

Mr. Lewis is scheduled to be sentenced on Tuesday morning. He faces life in prison without parole. He confessed to beating Ms. Vetrano, and traces of his DNA were found on her body. The defense argued his confession was coerced and the DNA evidence was unreliable.