OKLAHOMA CITY (AP) — One of two conjoined twins who were separated when 3 months old in 2009 has died.

Two-year-old Preslee Faith Wells died Saturday.

Preslee and her sister, Kylee Hope Wells, were born in October 2008 and were joined at the abdomen, with their livers and heart linings connected.

They were separated in a three-hour surgery at the University of Oklahoma Medical Center in Oklahoma City in January 2009. Kylee was able to go home that September.

The girls were believed to be the first known American Indian conjoined twins.

The girls' parents released a statement saying they are grateful for the time they had with Preslee and that Kylee is doing well.