Peter Windsor, 61, has been found guilty at Birmingham Crown Court of stalking Myleene Klass and her Classic FM colleague Katie Breathwick by posting items including an air gun and details of a will-writing kit.
Jurors reached their unanimous guilty verdict after deliberating for four hours and eight minutes over two days.
Windsor, wearing a grey sweatshirt, sighed and pursed his lips in the dock as the verdicts were announced.
Judge Tom Rochford told Windsor, who has been on remand throughout his trial, that the options for his sentencing included prison or two types of hospital orders.
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