Michael Miller was found shot to death Sunday morning at Wells and Douglas roads.
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The Madera County Sheriff's Office initially detained 32-year-old Trisha Lynn Richardson as a person of interest in the case.
On Monday afternoon, they said she admitted to having a romantic relationship with Miller and confessed to killing him.
Richardson was arrested and booked into the Madera County jail on charges of first-degree murder and interfering with an officer.
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Her bail is set at more than $1 million.