Inside the hunt for Kirk's killer

TIMELINE: FROM LOOKING FOR A SNIPER TO ROBINSON'S PARENTS CONVINCING HIM TO SURRENDER

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Authorities have shared their most detailed account yet of the investigation set off by the killing of American conservative activist Charlie Kirk, which concluded with a suspect surrendering to police.

Here are key details Utah County prosecutor Jeffrey Gray released about the case centering on 22-year-old suspect Tyler Robinson:

'Sniper positions'

When a lone gunshot rang out during Kirk's outdoor event on 10 September, a Utah Valley University police officer believed the weapon to be a rifle "because of its sound", Gray said, and began looking for "potential sniper positions".

About 150m away, the officer spotted a roof area "as a potential shooting position".

There, he found "impressions in the gravel" consistent with the body of a "person in a prone shooting position".

Security surveillance footage confirmed that an individual in dark clothing was on the roof at 12.15pm local time, Gray said. That revelation marked the start of a 33-hour manhunt.

The attack

The apparent suspect entered campus at 11.51am local time, wearing a black shirt with an American flag in the centre, a dark baseball cap and large sunglasses, Gray said. His posture appeared to indicate that he was hiding something.