You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
The_Sun_(United_Kingdom)

Context:
On 22 September 2003 the newspaper appeared to misjudge the public mood surrounding mental health, as well as its affection for former world heavyweight champion boxer Frank Bruno, who had been admitted to hospital, when the headline "Bonkers Bruno Locked Up" appeared on the front page of early editions. The adverse reaction, once the paper had hit the streets on the evening of 21 September, led to the headline being changed for the paper's second edition to the more sympathetic "Sad Bruno In Mental Home".

Question:
What had happened to Frank Bruno to spur the publishing of a story about him?

had been admitted to hospital