A Montana woman, accused of pushing her husband off a cliff, was charged with second-degree murder on Monday during her first appearance in U.S. District Court in Missoula, Mont.

Jordan Linn Graham, 22, and Cody Lee Johnson, 25, had gone hiking in Montana's Glacier National Park when an argument between the two culminated in Graham pushing her husband of just more than a week off a cliff, CNN reported, adding that if convicted, Graham could face life in prison.

According to the complaint document cited by CNN, the incident happened on the night of July 7 as the couple was having a heated argument. It is not yet clear what the fight was about, but Graham reportedly told a friend that she was having second thoughts about having married Johnson.

CNN reported that Graham sent the friend a text message the same day saying, "Oh well, I'm about to talk to him," to which the friend responded, "I'll pray for you guys."

Graham wrote back: "But dead serious if u don't hear from me at all again tonight, something happened."

Reportedly, at one point during their argument, Johnson grabbed his wife by the arm, which prompted her to push him off the cliff.

"Graham stated she could have just walked away, but due to her anger, she pushed Johnson with both hands in the back and as a result, he fell face first off the cliff," the complaint read, according to CNN.

Johnson’s body was not found until days later.

According to a Daily Mail report, Graham initially told investigating officers that her husband had left with unidentified friends in a dark-colored car with Washington state license plates. But a few days later, she told park officials she had spotted Johnson's body in a “place he wanted to see before he died.”