Heather Ethlene Mangum Stewart died June 4, 2025, at her home in Bluffdale, Utah, after her valiant effort to heal from pancreatic cancer. She was born March 24, 1975, in Houston, Texas to James Irvin Mangum, Jr and Olivia Croft Mangum. Heather grew up with her nine siblings in Pleasant Grove, Utah and has been described as the “glue” in keeping the family together.
She graduated from Pleasant Grove High School, where she participated in cheerleading, band, and seminary council. She grew up in Girl Scouts as “Harley” and continued as a camp counselor and troop leader through much of her adult life with her daughters. She served as Miss Pleasant Grove and loved camping, hiking, horses and being outdoors. After high school, Heather attended Brigham Young University and completed a bachelor's degree in Family Science and Human Development. She then earned a master's degree in Family Financial Planning from Texas Tech University, completing internships in West Palm Beach, Florida and New Zealand.
After a serendipitous meeting at the Salt Lake City Airport and a summer courtship, she was sealed for eternity to Justin John Stewart on Jan 29, 1999, in the Mount Timpanogos Temple in American Fork, Utah. Heather and Justin first lived in Novato, California where Heather landed her first job as a Certified Financial Planner (CFP) after receiving her master's degree and CFP designation. They also loved living in Lehi, Utah and Eldersburg, Maryland. Finally, they settled in Bluffdale, Utah where they raised their five children.
In addition to working as a family financial planner, Heather was a gifted and beloved group fitness instructor. Her many students loved her positive energy, infectious enthusiasm, and radiant light. She cherished her relationships with her fellow teachers and students and invested many hours in this passion. Her greatest joy was in being a wife and a mother to her five children. She faithfully supported her daughters in their passion for dance and her sons in swimming, volleyball, soccer, and many other diverse interests.
Heather was a woman with exceedingly strong faith in Jesus Christ. She loved attending the temple and faithfully served in many capacities in the Church of Jesus Christ of Latter-day Saints. Her goal of attending the temple 50 times in her 50th year will have to be completed by her posterity. Her faith in the Lord sustained her through her cancer journey. She remained kind and full of love and radiated positivity to the end.
Heather is survived by her husband, Justin, and children: Savannah Grace Assenheimer (Ben), Rachel Ethlene, Reed Maxwell (serving a mission for the Church of Jesus Christ of Latter-day Saints in Syracuse, New York), Grant James, and Ren Joseph. She is also survived by her mother, Olivia Mangum, and nine siblings: Kellie Pedersen (Mark); Olivia Rachel Weber (Peter); James I Mangum, III (Judy); Kenn Mangum (Natalie); Esther Swensen (Jared); Elizabeth Mangum; Christina Mangum (Jaclyn); Summer Corbit (Ryan); and Thomas Mangum.
Viewings will be held June 9, 2025, from 6:00-8:00 PM and June 10, 2025, from 10:00-10:45 AM. Funeral service will be June 10, 2025, at 11:00 AM. All services are located at 15429 Iron Horse Blvd, Bluffdale, UT 84065. The funeral service will be broadcast as a webinar at https://zoom.us/j/93090879620 . The Interment will be in Riverton City Cemetery.
Service Recording: https://youtu.be/WAFgj6V193Q
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