<sod >Â  Hall had been held by the group since 21 September 2015, and was one of a group of four hostages that included fellow Canadian John Ridsdel, who was killed in April.< eod>< sod > Â  Mr Hall had been held by the group since 28 September 2015, and was one of five hostages that included fellow Canadian John Ridsdel, who was killed by the group in April.< eod>