Peter Fonda and Graham Greene have joined the cast of the PBS telepic “A Thief of Time,” Tony Hillerman’s follow-up to “Skinwalkers,” which aired on the pubcaster in 2002. In addition, a third Hillerman adaptation, “Coyote Waits,” has also been announced. Like “Skinwalkers,” the new pics will air as “American Mystery!” specials. Robert Redford and Rebecca Eaton will exec produce. Fonda and Greene join Wes Studi and Adam Beach, who reprise their “Skinwalkers” roles as Navajo tribal policemen. “Skinwalkers” helmer Chris Eyre will direct “Thief” from a script by Alice Arlen. Jan Egleson is onboard to direct “Coyote,” which is being adapted by Lucky Gold.