Suspect arrested: Lisa Jackson, 24 (pictured), was arrested on Saturday on first-degree murder charges related to the death of her former boyfriend's wife, Cathy Walker

A tortured love triangle is thought to be the reason behind a mysterious murder on an Oahu, Hawaii military compound five months ago.

Cathy Walker was found stabbed to death and her throat slashed inside the home she shared with her husband, 36-year-old Army medic Mike Walker, on the Aliamanu military reservation the morning of November 22.

The case went unsolved for months until Saturday, when investigators arrested 24-year-old Alisa 'Lisa' Jackson on first-degree murder charges connected to Cathy's death. She was found 4,400 miles from the crime scene - in Fort Wayne, Indiana.

While friends described the Walkers as the perfect couple, it appears there was serious issues in their relationship and Mike was allegedly dating Jackson at the time of his wife's death.

Since the grisly murder, Jackson had moved to Fort Wayne, where she was arrested on Saturday.

Jackson's first arraignment was scheduled for Monday and she was expected to be extradited back to Hawaii to face the first-degree murder charges.

Because the crime happened on a military base, federal prosecutors could ask for the death penalty if Jackson is convicted.

According to court documents obtained by Hawaii News Now, investigators say Jackson stabbed Cathy to death and say the crime was 'premeditated and required substantial planning'.

Scroll down for video

Grisly: Cathy Walker, 38 (left), was found stabbed to death in the Hawaii home she shared with Army medic husband Mike Walker, 26 (right), on November 22

Sources told the outlet that Mike Walker is not currently a suspect in his wife's death, but investigators are apparently looking into whether he may have known about his mistress's plot.

Cathy Walker's body was found 6.30am on November 22. At the time, Mike Walker told investigators that they had argued the night before, before he went to work at Tripler Army Medical Center.

But he claimed he had nothing to do with her death, and was working when she was killed.

Cathy Walker's father also expressed that he didn't suspect his son-in-law of killing his daughter.