Instead, the supposedly dead wife came outside and confessed to sending false messages from Dudley's phone.
Police were told the couple had been fighting over allegations Dudley had been cheating on his wife.
The couple's fight escalated, with the 44-year-old picking up her husband's computer and throwing it on the ground.
During an interview with police, Nielson admitted to taking her husband's phone and sending fake text messages to the woman.
Nielson said she wanted to see if the woman would be an accomplice in covering up a crime and how she would react, court documents state.
She was arrested for criminal mischief and falsely reporting an emergency. She was booked into the Utah County Jail.