Barbara Henning, the wife of British hostage Alan Henning, has urged his Islamic State captors to "please release him, we need him back home".
The 47-year-old aid worker was captured by militants in Syria last year and has been threatened with death by his Islamic State captors.
The wife of British aid worker Alan Henning has recorded a message for Islamic State - her husband's captors - urging them to spare his life.
Barbara Henning told BBC News that her call was joined by "Muslims across the globe" and hoped that the militants would "open their hearts and minds to the truth about Alan's humanitarian motives".
She added: "Some say 'wrong time, wrong place'. Alan was volunteering with his Muslim friends to help the people of Syria. He was in the right place doing the right thing".
The oldest member of Alan Henning's family has demanded boots on the ground to combat Islamic State militants who killed their beloved Alan.
The wife of a British aid worker held by Islamic State militants has recorded a message to his captors appealing for his life to be spared.