Rick Bowmer/APKouri Richins, the Utah mom accused of spiking her husband’s Moscow mule with a lethal dose of fentanyl and then writing a kids’ book about grief, appears to be in even more trouble.In a new court filing, prosecutors alleged that deputies in the Summit County jail searched Richins’ cell last week and found a six-page, handwritten letter for her mom that detailed a brazen plan to tamper with a witness in her case.The letter, allegedly found hidden inside a book, started with the wor
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