( CNN ) -- An Ohio judge on Tuesday set a $ 1 million bond for the man accused of kidnapping and keeping a 13-year-old girl bound and gagged in his basement , authorities say . Matthew Hoffman , 30 , is suspected of having abducted Sarah Maynard , who authorities discovered over the weekend . She disappeared on Wednesday along with her mother , brother and family friend . Sarah Maynard 's mother , Tina Herrmann , 32 , remains missing , along with 10-year-old Kody Maynard and Herrmann 's friend , 41-year-old Stephanie Sprang . Hoffman appeared in the Mount Vernon Municipal Court on Tuesday via a video link with the local jail , according to Pam Fuller , a deputy clerk . He is represented by a public defender . Hoffman sat in a corner and looked straight ahead during much of the proceeding . He wore what looked to be a green vest , which the local sheriff later described as a suicide gown . Knox County Sheriff David Barber said Hoffman was put in the gown after he gave indications to the jail staff and to investigators he could try to harm himself . Previously , Barber has said he believes Hoffman could `` absolutely '' lead police to the three missing people . He is not cooperating with the investigation , officials said . `` The likelihood is , of course , that they are not alive , '' Barber said about Herrmann , her son and Sprang . But he added he hopes they are , and that the department 's priority remains trying to find them . Sarah Maynard was released from the hospital Monday . Barber described the girl as doing well under the circumstances . `` There 's so many people behind her that definitely that 's going to help with her emotional recovery . And she is receiving those kind of services as well , '' he said . The sheriff asked members of the public to think back to last week , to what they may have seen , and to call a tip line with any information . `` Wherever the investigation leads us , that 's where we 're going , '' he said . The next hearing in Hoffman 's case is scheduled for November 23 . Authorities have said they expect additional charges .
Matthew Hoffman , 30 , is accused of abducting 13-year-old Sarah Maynard . She was found bound and gagged in the basement of a home where he lives . Maynard 's brother , mother and family friend remain missing . Hoffman is not cooperating with the investigation , authorities say .