After serving time in Arizona for murder he wanted a second chance Then time started running out

TUCSON — As the sun set over the city on an ordinary Thursday in December, Jon Sperberg shuffled out his apartment door. His destination was a white metal chair at the end of the open air corridor, looking east toward the Rincon Mountains. The chair wasn’t far, perhaps 4 yards. But for Sperberg, sapped of energy and under siege from acid reflux, the walk was arduous. Terminal stomach cancer had robbed him of easy movement, of a gastrointestinal tract that could handle the vagaries of digestion, and of time. He sat down with effort, the sharp angles of his body…