A man who was critically injured on Wednesday after he entered an M.R.I. room on Long Island and was pulled into the machine by his chain necklace died the next day, the authorities said on Friday.

The man, 61, was in critical condition after entering an exam room in Westbury, N.Y., on Long Island, without authorization while a scan was in progress, the authorities said.

The Long Island man killed in a freak MRI accident while wearing a massive 20-pound chain was led into the machine room by a forgetful technician and wound up attached to the machine for an hour be… ...