US state of Missouri executes killer after appeal fails

The Midwest US state of Missouri has executed a man convicted of killing a jewelry store owner during a 1991 robbery after the US Supreme Court denied last-minute appeals that in part challenged the drug used in the execution, the state's top lawyer said.

Herbert Smulls, 56, has been executed. Credit: Reuters/Missouri Department of Corrections

"After the United States Supreme Court vacated three separate stays of execution on January 29, 2014, Herbert Smulls was executed for the 1991 murder of Stephen Honickman," Missouri Attorney General Chris Koster said in a statement.