Abbey Flyte would have been 8 months old at the end of February.
Doctors delivered Abbey several weeks premature, and Katie died without ever knowing she gave birth.
On February 1, Kenny Flyte checked on the little girl in bed and saw that she wasn't breathing.
He started CPR, but Abbey was unresponsive. Doctors believe Kenny found his daughter in the middle of a SIDS episode, but they don't know how long the girl wasn't breathing.
She was rushed to the hospital where Kenny remained by her side.
The girl's aunt, Jill Brehan, said doctors twice tried to take the baby girl off a ventilator, but she could not breath without assistance.
Doctors believe the girl might have suffered oxygen deprivation in the womb when her mother stopped breathing.
On Sunday, her family put Abbey in a pink dress and held a baptism service before removing the girl from life support.
She died in her father's arms.
Abbey "looked like a porcelain doll," Brehan said, because the girl was no longer hooked up to feeding and breathing tubes.
Doctors said the girl is an organ donor and may be able to help save several lives.
She will be buried next to her mother in their hometown of Puyallup.
Kenny is back home taking care of his other son, Jacob, who is 2 1/2 years old, Brehan said.
If you'd like to help the Flyte family, you can donate online to the KOMO Problem Solvers fund.