A woman has died and her husband, who was in prison, got ill after they allegedly consumed poisonous substance in district jail, police said on Thursday.

The incident took place on Wednesday when Neelam Sahni (23) had gone to meet her husband Suraj Sahni (25) in the jail and both consumed biscuits laden with some poisonous substance, Station House Officer (SHO), city police station, Praveen Singh said.