Campbell collapsed at the 22.5-mile mark and received medical attention at the scene before later dying in hospital. He was running the marathon to raise money for the Brathay Trust, and his JustGiving page raised over £350,000.
Campbell and fellow contestant Tom Peters met on MasterChef: The Professionals in 2017. Peters, along with Jamie Park, co-organised a symbolic run to complete the marathon in Campbell's honour.
The 2018 London Marathon was the hottest on record at the time, with 24-degree heat. The exact cause of Campbell's death has not been confirmed, and it remains unclear whether the heat or an underlying health condition contributed to his collapse.