The death of a Sri Lankan woman detained at a central Japan immigration facility has been in the spotlight as the Diet debates a controversial bill to revise the immigration law, with critics fearing the revision will worsen conditions for asylum-seekers in Japan.

While ruling parties aim to pass the bill during the current Diet session through mid-June to resolve the long-term detention of foreign nationals facing deportation orders, opposition forces have called for its abolishment as the government has yet to figure out the circumstances surrounding the Sri Lankan's death.

Ratnayake Liyanage Wishma Sandamali, 33, who had been detained since August last year at the Nagoya Regional Immigration Services Bureau in Aichi Prefecture for overstaying her visa, died on March 6 after complaining of a stomach ache and other symptoms from mid-January.