ST. GEORGE, Utah — The transgender live-in boyfriend of Charlie Kirk’s alleged assassin appears to have fled their cozy Utah townhouse, leaving mail piling up outside — as he faces mounting criticism for not turning the accused killer in after he confessed to the hateful slaying in a string of text messages.

Lance Twiggs, 22, who has reportedly been cooperating with authorities since his partner, Tyler Robinson, 22, allegedly shot the Turning Point USA founder dead during a speaking event on Sept. 10, has disappeared, neighbors in St. George, Utah, told The Post Tuesday.

Mail was spotted piling up outside the $1,800-per-month townhouse the couple shared , as backlash from the public jeopardized his safety — and cops are still a presence in the quaint community even two weeks after

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