Multimedia University students demand justice after police shooting left four injured during protests over exams and governance disputes.
Tonui succeeds Ranson Lolmodooni, who has led the GSU since July 12, 2024.
Gunmen stormed an informal settlement near Johannesburg and shot dead 12 people overnight, South African police said Wednesday.
His exit came after a pre-show controversy in his hometown of Bethlehem, Pennsylvania, with a controversial decision to resign from the police force after less than a year to join the reality series.
Hundreds of people had gathered at the annual Old West End Festival, which features live music, food vendors and family-friendly activities, when the gunfire erupted.
Police-related killings surged in May, making it the deadliest month of 2026 so far, with 24 deaths largely linked to protest policing and growing concerns over accountability and custodial deaths.