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AURORA — An Aurora hospital where a Minnesota woman gave birth to conjoined twins said Thursday that one of the babies died after a complicated five-hour separation procedure.

Amber McCullough delivered the girls, Hannah and Olivia, by cesarean section Wednesday. Doctors immediately had to separate them due to the severity of the conditions of their hearts, Children’s Hospital Colorado spokeswoman Elizabeth Whitehead said.

Olivia, who had not been expected to survive because of problems with her heart, died. Hannah is in critical but stable condition, Whitehead said. McCullough, a native of Hastings, Minn., is recovering.

A team of doctors performed the procedure 32 weeks into McCullough’s pregnancy.

The twins shared an abdomen, liver and intestinal tract. The girls had separate hearts and kidneys. McCullough told KARE-TV in Minneapolis that Olivia only had a single ventricle in her heart and was missing valves.

Conjoined twins happen once every 200,000 live births, according to the University of Maryland Medical Center, which says between 40 and 60 percent arrive stillborn.

Surgical separation is still rare, according to the medical center, which says that, since 1950, at least one twin survives separation about 75 percent of the time.

McCullough said she spent eight years in the Army, then went to law school and is now an attorney. She has a 6-year-old son named Tristan from a previous relationship that ended in divorce. She said her son is moving to Denver to be with her soon.

She became pregnant with her girls during another relationship, and it wasn’t until her second trimester when she learned she was carrying conjoined twins. The relationship with the girls’ dad ended shortly thereafter.

McCullough has lived at the Ronald McDonald House in Aurora since early this month. Her stepmother is there, keeping her company and caring for her.