Fotis Dulos, the man accused of murdering his estranged wife who was reported missing in Connecticut last May, was found unresponsive at his home on Tuesday after he apparently tried to kill himself, an official familiar with the case said.

Multiple officials initially said that Mr. Dulos had died. But soon after, reports emerged that there were attempts to revive him and he had been taken to a hospital in critical condition.

Mr. Dulos, 52, was charged early this month with the murder and kidnapping of his wife, Jennifer Dulos, 50, who vanished shortly after dropping off their five children at school on May 24.

Ms. Dulos’s body has not been found.

As of Tuesday afternoon, Mr. Dulos was being treated for carbon monoxide poisoning and was in critical condition, said Lt. Timothy McKenzie, a spokesman for the Farmington police.