Oklahoma City Woman Pleads For Information On Her Missing Little Sister

Anadarko police are asking for help tracking down a woman who's been missing almost two weeks.

Sierra Hunter Isaac vanished on Easter Sunday. Sierra's older sister and former guardian said she didn't know about her disappearance until more than a week after she was last seen. 

During that time, Sierra called her sister from a Texas phone number.

"She was clearly in distress, she was hysteric,” Sierra’s sister, Chelsey Hunter, said. “She said a lot of things that didn't make sense.” 

The last time the family saw Sierra was April 4 in Anadarko. She later made two phone calls to her siblings, including one on April 8.

"We almost get the chilling idea she couldn't tell us what she wanted to say because there was someone around her on the phone,” Hunter said. “And it just disconnected.”

Hunter said she didn't know her little sister was missing at the time of the phone call. It wasn't until Tuesday of this week when she found out no one knew where Sierra was.

"I went straight to the police,” Hunter said. "We just hit a brick wall. She just disappeared."

Hunter filed a missing person report the day she learned Sierra was missing, making sure to tell authorities that her sister is schizophrenic.

"The last person that has seen her said that she had no shoes on and she possibly was either shaved bald or she is bald,” Hunter said. “So that is significant knowing she's not in her right mind.”

A private investigator traced the number to Austin, Texas.

"They have registered that number to a person that has severe and violent -- it's an extent of criminal history," Hunter said.

Sierra is a member of the Wichita & Affiliated Tribes. Her case drew the interest of a group working to bring awareness to missing and murdered indigenous people. 

"We have to be for our people and bring light to it because it's an epidemic," Missing and Murdered Indigenous People Center Chapter of Oklahoma president Carmen Harvie said. “So, when one native person hurts and they're missing, their family -- we all hurt."

"We love you and we're looking for you,” Hunter said. “And we're praying and I hope those prayers are getting to wherever you are.”