A Utah author on trial for her husband’s murder after allegedly spiking a Moscow mule with a fatal dose of fentanyl is now accused of witness tampering, according to recently filed court documents. Kouri Richins is specifically accused of concocting a false narrative by requesting that her brother, Ronald Darden, tell defense counsel a specific story in an attempt to link her husband’s death to his alleged purchase of drugs. Richins, who authored the book Are You With Me?to help children cope with griefa year after her husband’s death, was arrested and charged with killing Eric Richins at their home in Klamas, Utah, southeast of Salt Lake City. Kouri…