At least two church members say they think that Mrs. Hawke-Petit endorsed an anti-death-penalty document known as a Declaration of Life. The declaration states a person’s opposition to capital punishment and asks that prosecutors, in the event of the person’s own death in a capital crime, do not seek the death penalty. The documents have been signed by thousands of people, including Mario M. Cuomo, the former governor of New York, and Martin Sheen, the actor.

“She was a nurse and she would not cause harm to anyone,” said Lucy Earley, a congregant who notarized at least a dozen declarations during an appeal at the church and said she thought Mrs. Hawke-Petit’s was among them.

Declarations of Life are often kept with a person’s will or other important papers; sometimes they are filed with registries. But it could not be independently determined whether Mrs. Hawke-Petit had signed one. Although the family’s home was heavily damaged in the fire and no independent copies have surfaced, death penalty opponents both inside and outside the church have kept trying to find one. A clear indication that Mrs. Hawke-Petit rejected capital punishment could help them mobilize, they say, not only in the Cheshire case but also on behalf of the nine people on Connecticut’s death row in Somers.

The opponents also say that a signed declaration by Mrs. Hawke-Petit opposing capital punishment could help counter the public outrage to the killings  outrage that has pressured state officials to suspend parole for violent criminals.

Still, if proof of Mrs. Hawke-Petit’s sentiments did surface, it would have little standing in court, lawyers and prosecutors say.

“Our job is to enforce the law no matter who the victim is or what the victim’s religious beliefs are,” said John A. Connelly, a veteran prosecutor in Waterbury who is not involved in the Cheshire case. “If you started imposing the death penalty based on what the victim’s family felt, it would truly become arbitrary and capricious.”

Michael Dearington, the state’s attorney who is prosecuting the suspects in the Petit killings, said he did not know whether Mrs. Hawke-Petit had signed a Declaration of Life. Asked if he knew Dr. Petit’s views on the death penalty, he replied, “I have a no comment on that.”