Sivaganga: A 39-year-old worker died after collapsing at a fertiliser manufacturing unit in Sipcot industrial estate near Manamadurai in Sivaganga district on Monday.Police identified the deceased as Jesudoss of Utharappuli village near Sivaganga. He was employed at the Aqua Agri fertiliser plant and was reportedly engaged in pouring a chemical liquid into a fertiliser production machine when he suddenly lost consciousness and collapsed.Co-workers rushed him to a private hospital in Manamadurai, where doctors declared him dead on arrival.His body was later sent to the Sivaganga Government Medical College Hospital for postmortem examination.Police have registered a case and have launched an investigation to ascertain the exact cause of death and are probing whether exposure to toxic fumes or any other workplace-related factor led to the incident.