Ohio carries out first single injection execution

The US state of Ohio has become the first in the country to carry out an execution with a single-drug injection, instead of a combination of three.



Fifty-one year old Kenneth Biros was put to death after the US Supreme Court denied his final appeal.



Biros had been convicted of the murder of a 22-year-old woman in 1991.



The new method was introduced because of concerns that prisoners could suffer extreme pain if the first of the usual three drugs fails to work effectively.



It also follows a failed attempt to execute a prisoner in Ohio in September, when officials struggled for two hours to try to find a suitable vein into which to inject the drugs.



All executions were put on hold while another method was sought.