The Massachusetts National Guard soldier from Quincy who died Friday in Afghanistan asked her relatives to press for answers if anything happened to her while she was deployed, according to her family.

"She did say to us that she had concerns about things she was seeing when she was over there," Ciara Durkin's sister, Fiona Canavan, said in an interview with WGBH-TV. "She told us if anything happened to her, that we were to investigate it."

Questions surrounding Durkin's death prompted US Senators John F. Kerry and Edward M. Kennedy and US Representative William D. Delahunt yesterday to call for the Defense Department to thoroughly investigate the death of Durkin, a Quincy resident.

In a letter, Kerry urged Defense Secretary Robert M. Gates "to deploy your staff on this matter immediately, so that the answers and circumstances around Specialist Durkin's death are uncovered, expeditiously and thoroughly."

Delahunt, a Quincy Democrat, said his staff met yesterday with Army officials to find out how Durkin died. Kennedy's office said he had spoken to Army Secretary Pete Geren yesterday to relay the family's concerns.

The Defense Department says it is investigating Durkin's death, which it described as a "non-combat-related incident." Durkin's family says Army officials have told them she was found with a single bullet in her head, lying near the church where she worshipped on the secure Bagram Airfield.

The Army has not publicly disclosed whether a weapon was found near her body.

The Massachusetts National Guard initially reported that Durkin was killed in action, though a Guard spokesman later said the term meant only that Durkin was serving in Afghanistan at the time.