PROVO, Utah (AP) — As authorities worked feverishly to find the person who at Utah Valley University last week, the 22-year-old man now charged with the crime was texting with his romantic partner and acknowledging he was the shooter, court documents revealed.

fired a single fatal shot from the rooftop of a building overlooking the outdoor venue where Kirk was speaking to about 3,000 people on Sept. 10, investigators say. Afterward, prosecutors say he texted with the partner, who he lived with near St. George, Utah, about 240 miles (387 kilometers) southwest of the campus.

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