Family members are still in shock after 48-year-old Cristin Caldwell of Idaho Falls was found dead and buried in her own basement.
Nancy Waters, Cristin's sister said she was woken up in the middle of the night to the horrifying news.
"We didn't see it coming. We didn't see this coming at all," said Waters.
Waters said Cristin would always call her mother every day after work, but on Tuesday they didn't hear from her.
Family members were immediately alarmed and police issued a missing person report, but by Thursday night they had found her body.
"This is horrific. They way this thing has happened is surreal," said Waters.
Police have issued a warrant for second-degree murder for Cristin's boyfriend of 10 years, 39-year-old Jeremy White, something Waters said she never could have imagined.
She said when she first met White, they got off on the wrong foot, but over time he redeemed himself.
"It was completely unexpected. He would say grace at lunch, breakfast, dinner, whichever," explained Waters.
The Bonneville County Sheriff's Office believes White has left the Idaho Falls area and may be traveling through the state.
Investigators believe Deena Rane Aday may be with him and at this point is considered missing and possibly endangered.
Police believe the pair is traveling in a 2004 silver Jeep Cherokee with Idaho license plates 8bhv461.
While police search, family members remain speechless.
"There is nothing I could say. I can't even ask him why, because there will never be an answer acceptable to that question," said Waters.
Now, Waters said she just takes solace in her last conversation with the sister she loved so dearly.
"I've cried so hard because that is my sister, but I am so thankful and so blessed that the last words that came out of my mouth to her was I love you," said Waters.
Police said White should be considered armed and dangerous. Anyone with information is urged to contact the Bonneville County Sheriff's Office.