Tragic Lisa Vilate Williams was gunned down as she decorated her boyfriend's Christmas tree.
The shocking revelation came from her mother Tawny Williams who spoke about her final moments.
Chelsea Watrous Cook allegedly fired the fatal shots into her torso.
In a heartbreaking post on Facebook, Lisa's mom opened up about her daughter's death.
She revealed: "My beautiful Lisa, she was murdered while decorating a Christmas tree with homemade ornaments she was making with the kids (3 year old twins)."
Tawny wrote in reference to Lisa's boyfriend's Travis Cook's children which he shares with ex-wife Chelsea Watrous Cook, 32.
She added: "She was so kind, sweet, generous, loving, and brought joy and excitement to every aspect of life.
"Please share the beauty of her life rather than the monster that ripped her from ours. She was magic, and I want her remembered for how she lived and not for how she was killed."
The incident took place on November 25 after Cook visited her ex-husband's home in Salt Lake City, Utah.
Cook was asked to leave by him but she refused and locked herself in the bathroom
After remaining in the bathroom for some time, Cook allegedly opened the door and walked towards her coat, leaving him to believe she was finally leaving, according to the affidavit.
However, police claim instead she pulled out a gun and fired at her ex's 26-year-old girlfriend, hitting her twice, causing the victim to slump on the couch.
Cook's ex-husband told officers that he quickly grabbed the gun from his ex-wife and did his best to give CPR to his girlfriend as his children watched.
Meanwhile, Cook "walked over to their children and sat on the recliner chair."
When she attempted to leave, the ex-husband allegedly pinned Cook against the wall until police arrived.
Williams was then rushed to a nearby hospital where she died.
Originally from Colorado City, Arizona, moved to Salt Lake City in 2015 to care for her sister where she worked in a bank.
Chelsea Waterous Cook, 32, was arrested on suspicion of aggravated murder in connection with the shooting.
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