State Dept Spokesman Sean McCormack confirmed that one American died in the bomb blasts in Egypt on Saturday.
Las Vegas native Kristina Miller (search) was in Egypt celebrating her 27th birthday with her British boyfriend, Keri Davies. She spoke to her father by telephone just before the attacks.
"She was telling me about all the gifts she was bringing everyone, how she was going to spend her birthday that Friday going horseback riding and then going out to dinner with her boyfriend," Tony Miller told The Associated Press.
"I told her I loved her, she said she loved me and that she'd call me the next day. That was the last time I heard from her," Miller said Monday.
Hours later, she was dead — killed along with the boyfriend in the bombings Saturday at the Red Sea resort of Sharm el-Sheik (search).
"We learned the sad news recently that there was an American citizen who died as a result of these bombings," McCormack said. "Certainly our thoughts and prayers go out to her family and friends. It's a tragic event. And our thoughts and prayers also go out to all the other victims of this terrible act."
Miller was on the late night shift in the English town of Fareham, where he works for an English sports betting firm, when the news broke of an explosion in Sharm el-Sheik.
"This is a very popular resort for the British; coming here is like us going to Cancun," Miller said. "She'd never heard of it, I'd never heard of it, but they said it was safe. There were never any problems," he said of Sharm el-Sheik.
Miller frantically tried to reach his daughter and her boyfriend, dialing their cell phones and hotel for hours after the explosions ripped through the resort, killing scores of people.
After failing to reach either of them, Miller boarded a plane for Egypt carrying photographs of both. He was met at a Cairo hotel by an official from the U.S. Embassy who told him they'd found his daughter.
Miller said Davies also was killed. The British Foreign Office announced the death of a British national in the explosions but would not provide any other details.
The U.S. Embassy in Cairo said one American citizen was among the dozens killed early Saturday in the bombings. Embassy spokesman John Berry declined to identify the victim.
Egyptian officials said she was wounded in the blasts and brought for treatment in Cairo, where she died.
"We've been watching this all weekend and praying they weren't there," her aunt, Ann Miller, said Monday from Las Vegas. "She was a real sweet girl."
Tony Miller said FBI officials would perform an autopsy on his daughter's body in Dover, Del., and he was making arrangements for her funeral in Las Vegas for later this week.
"I just never thought in a million years that Kristi would be gone," he said.
Miller said his daughter moved to England in January to work with him, and that's where she met Davies. Everyone expected them to get married, the father said.
"He never proposed, but it was right around the corner, everyone knew it. Everyone called him my son-in-law," Miller said. He said he had spoken to Davies' parents, who said they were visited by a British official to inform them of their son's death.
Kristina Miller is the only American known to have been killed in the Egypt bombings.
FOX News' Teri Schultz and The Associated Press contributed to this article.