LOS ANGELES, United States (AFP) — The man accused of murdering influential right-wing campaigner Charlie Kirk broke down in tears of regret days after the killing, according to video testimony played in a United States (US) court on Thursday.

The development came on the fourth day of a hearing to determine if there is enough evidence to try 23-year-old Tyler Robinson for the university campus assassination of the influential Kirk, a supporter of Donald Trump who was credited with mobilising a huge youth vote for the 80-year-old Republican president.

“I just asked him in person if what he said was true the night before, and he said it was,” Robinson’s roommate Lance Twiggs told investigators in the taped interview.