The inquest heard Tinley had been in remission from a lymphoma that was found in 2017, but a biopsy on a lesion on his leg in December 2023 showed it had returned.
He underwent a CT scan in January 2024.
The coroner, Deputy Viscount Matt Berry, said the cancer had spread, including a mass in Tinley’s pelvis.
He said that his GP surgery and the haematology and dermatology departments at Jersey General Hospital were all informed.
However, Tinley and his wife were not told until an annual oncology check-up in May 2024, and he did not start comprehensive treatment until July 2024.