In this Aug. 25, 2015 photo provided by KUSA-TV, expectant mother Amber McCullough is pictured during an interview with Colorado's KUSA-TV, a day before she was to give birth to conjoined twins in Aurora, Colo. McCullough, of Hastings, Minn., was scheduled to deliver twin girls at the Colorado Fetal Care Center at Children's Hospital Colorado by C-section on Wednesday, Aug. 26, 2015. Hospital officials said Wednesday they had no update on the surgery. (KUSA-TV Photo via AP)

A Colorado hospital where a Minnesota woman gave birth to conjoined twins says one of the babies has died.

Amber McCullough delivered the twin girls, Hannah and Olivia, by on Wednesday. Children's Hospital Colorado spokeswoman Elizabeth Whitehead says Olivia died after a 5-hour separation procedure.

Whitehead says Hannah is in critical but stable condition in a unit, and her mother is recovering.

The twins shared an abdomen, liver and . The girls had separate hearts and kidneys. Doctors performed the procedure 32 weeks into McCullough's pregnancy.

McCullough, a Hastings, Minnesota, native says in a statement that she believes in the power of prayer and the hospital's talented doctors.

She told KARE-TV in Minneapolis that Olivia was not expected to survive because of problems with her heart.