The execution of an inmate is raising questions about lethal injection
Kenneth Williams was the fourth inmate put to death in eight days in the Arkansas.
His death on Thursday night raised fresh concerns about whether the sedative midazolam is effective in lethal injection mixes.
Williams reportedly coughed and convulsed during the procedure.
This is very disturbing, but not at all surprising, given the history of the risky sedative midazolam, which has been used in many botched executions Shawn Nolan, Attorney for Kenneth Williams