Tennessee hasn't ruled out executing Christa Pike again. Her condition could stop it.

Christa Pike, pictured in 2007, had been scheduled for execution for a killing she committed in 1995. (via REUTERS / REUTERS) Tennessee's top prison official is stepping down after the state's failed attempt to execute Christa Pike, Gov. Bill Lee announced Saturday. Correction Commissioner Frank Strada will leave this month. In a statement, he said resigning was "in the best interest of Tennesseans" while an independent review examines what happened Wednesday, when Pike survived two doses of pen…