Thomas Jr believed hospital staff discriminated against them because they were from the traveller community.
“I can’t believe my father is dead. The destruction this has brought on our family is incomprehensible,” he added.
In her letter to hospital chief executive Dawn Scrafield, the Liberal Democrat MP Goldman said people had written to her about the “tragedy”.
“Given the severity of this incident, there is understandable concern about what immediate action is being taken to protect patients,” she wrote.
Goldman urged the hospital to consider a formal investigation into Casey’s death.
Christine Blanshard, chief medical officer at Mid and South Essex NHS Foundation Trust, said: “Our condolences go out to the patient’s family.
“We will be investigating the care he received and inviting his family to meet with us and discuss their concerns.”
