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 brother of a 10-year-old boy whose body was found in a beachside forest in New Zealand has been arrested. Eric McIsaac, 25, was charged with burglary following his arrest for possession of an illegal knife by investigators who are probing the death of Alex Fisher. The young boy went missing at Waitarere Beach, north of Wellington on the North Island, last Monday. Police revealed last week they had arrested a man in connection to the boy's death but the man's name was suppressed until Wednesday, the The New Zealand Herald reported. The 25-year-old fronted Levin District Court before Judge Gregory Ross, who ordered a mental health assessment to be carried out on McIsaac.Alex Fisher's brother has been arrested after the 10 year old's deathIt was revealed Eric McIsaac, 25, has been taken into custody by policeHe was first arrested on knife possession and then charged with burglary 
 Question:_ was last seen on CCTV footage with McIsaac in a Waitarere supermarket last Monday evening.

Alex Fisher