(CNN) Fotis Dulos, who was charged with killing his estranged wife, was declared dead Thursday, his attorney said.

Authorities believe Dulos made an apparent suicide attempt Tuesday, according to two law enforcement sources. He was in "dire" condition Wednesday at a New York hospital, his attorney said, and he was in a hyperbaric chamber.

"His family came in from Greece and decided today to donate his organs so that he will live on in some form in the assistance that he can provide to others in their own individual struggles," Norm Pattis told reporters Thursday.

The estranged husband of Jennifer Farber Dulos failed to appear at an emergency bond hearing Tuesday after one of the properties used to secure his $6 million bond was determined to be in foreclosure and didn't meet the bond requirement set by the court.

Officers later found him at his Farmington, Connecticut, house in distress and called for an ambulance. Fotis Dulos, 52, was initially taken to a local hospital for treatment of carbon monoxide poisoning and then transferred to the hospital in New York.

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