The state of Indiana in the United States has carried out its first execution in fifteen years, putting to death a man, whose lawyers say he was mentally ill, murdering four people in 1997, including his own brother.

Joseph Corcoran, forty-nine years, was executed by lethal injection and pronounced dead early yesterday morning at the Indiana State Prison in Michigan City, officials said.

Corcoran’s lawyers argued in court filings that carrying out the death penalty would violate the Constitution because he had long suffered from paranoid schizophrenia, including experiencing hallucinations and delusions, making him unable to understand the severity of his crimes.