Tonight, unless an unlikely eleventh-hour reprieve is granted, Texas will execute its 400th inmate since the state resumed the practice in 1982. Johnny Ray Conner32-year-old Johnny Ray Conner was convicted for murdering Houston resident Kathyanna Nguyen during a grocery store robbery in 1998. Nguyen, the store's owner, had been trapped behind the counter and was surrounded by a bulletproof enclosure; the killer reached his gun through the change slot and shot her in the head.......