PROVO, Utah — During the frantic search to find Charlie Kirk's assassin , the 22-year-old man now charged with capital murder texted his romantic partner and confessed to carrying out an attack he planned for more than a week, court documents said.

Prosecutors revealed a series of incriminating texts, a hidden note and DNA evidence while announcing the charges and their intent to seek the death penalty against Tyler Robinson in the killing of Kirk, a prominent conservative activist and confidant of President Donald Trump .

Investigators say that sometime after Robinson fired a single fatal shot from the rooftop of a Utah Valley University building overlooking where Kirk was speaking to about 3,000 people on Sept. 10, he texted his partner and said to look under a keyboard.

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