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 maid who survived the D.C. mansion murders because she was told not to come to work that day has revealed the voicemail her boss sent her the day before he died. Nelitza Gutierrez, who worked for the Savopolous family, received the message from CEO Savvas Savopoulos on May 13, the day before he, his wife, his son and another housekeeper were killed in their lavish mansion. Gutierrez shared the evidence with ABC News's 20/20 show, and said that several things about the voicemail, left around 9:30pm, are were unusual. It is believed that by the time it was sent, Savopoulos and his family had already been taken captive, allegedly by Daron Wint, 34, who is in jail charged with all four murders.Nelitza Gutierrez got voicemail from Savvas Savopoulos before murdersHe told her that his wife was ill and another housekeeper was staying overThe next day Savopoulos, his family and housekeeper were found deadGutierrez shared message from composed-sounding Savopoulos, whom investigators believe was then being held hostage in his own homeDaron Wint, 34, is charged with the four murders and will appear in court 
 Question:Investigators believe the Savopoulos family were held overnight by _, before he killed his victims then set the house on fire in a bid to destroy the evidence.

Daron Wint