Article continues below advertisementCharlie Kirk's alleged assassin, Tyler Robinson, is being kept under tight supervision following his arrest - but according to a former Bureau of Prisons official, the strict conditions aren't meant to "silence" him.The 22-year-old suspected killer remains on suicide watch in an isolated cell inside of Utah County Jail's Special Housing Unit roughly one month after the right-wing political activist was shot dead in the neck at age 31 while speaking at a Turning Point USA event on a college campus.