Tyler Robinson

Lance Twiggs, Tyler Robinson's ex-roommate and lover, described his behavior after he allegedly returned home following the Charlie Kirk shooting.

WATCH: Tyler Robinson’s former roommate and ex partner testified at his preliminary hearing, describing when their relationship began in a recorded interview played in court.

Prosecutors are expected to present a recorded interview in which Tyler Robinson's former roommate allegedly said he confessed to killing Charlie Kirk. Robinson returned to court today for the fourth day of his preliminary hearing.

Preliminary hearing underway for Tyler Robinson accused of assassinating conservative activist Charlie Kirk. Kirk's widow, Erika, and his parents are in attendance, with Donald Trump Jr. present in court to support the family.

Tyler Robinson arrived at the Utah County courthouse in an armored SWAT vehicle. His defense team is expected to argue for sealing evidence and police testimony, and to seek sanctions against prosecutors for publicly discussing the case.