Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: The former chairman of Bradford City was linked to eight other fires before the Valley Parade blaze that killed 56, a new book has claimed. Author Martin Fletcher claims the devastating fire was not an accident and has revealed a sequence of other blazes at businesses owned by or associated with Stafford Heginbotham, the club's chairman at the time. After an inquiry, high court judge Mr Justice Popplewell said the fire was not started deliberately and was caused by a discarded cigarette. West Yorkshire police today said in a statement that they would review any fresh evidence surrounding the tragedy.Author Martin Fletcher claims the devastating blaze was not an accidentBook reveals fires at other businesses owned by or associated with then club chairman Stafford HeginbothamMr Fletcher, a survivor of the blaze, says his findings warrant investigationAn inquiry into fire found it was an accident caused by discarded cigaretteWest Yorkshire Police will consider any fresh evidence that comes to light 
 Question:Mr Fletcher started to investigate after a conversation with his mother nine years after the disaster, when she told him it had not been _'s first fire.

Stafford Heginbotham