( CNN ) -- Leeland Eisenberg is missing yet again . The 52-year-old New Hampshire man , who took hostages six years ago at one of Hillary Clinton 's campaign offices , was not in his Manchester halfway house when he was supposed to be Sunday afternoon , according to the New Hampshire Department of Corrections . Authorities say they are considering it an escape because Eisenberg did not let anyone know he was leaving , as he is required to do . They said he is not considered armed or dangerous . This is at least the second time Eisenberg has left authorities wondering about his whereabouts . He was released in 2009 after serving two thirds of a three-year sentence . But in February 2010 , he violated his probation by cutting off his GPS tracking bracelet . He was arrested about a day later and eventually received a new sentence of 3 1/2 to 7 years . He is eligible for parole in August . Eisenberg has a history of mental illness and substance-abuse problems , authorities say . In 2007 , he entered Clinton 's campaign office in Rochester , New Hampshire , with road flares strapped to his chest . He claimed he had a bomb , and he held several hostages for five hours . Clinton was in Washington at the time . In an interview with CNN in 2007 , Eisenberg said he took the hostages to raise awareness about mental health issues . `` I wanted to sacrifice myself for mental illness and bring about the discussion about mental illness , '' Eisenberg said . Furthermore , he said , `` I wanted the police to kill me . '' He was convicted of multiple counts of kidnapping , criminal threatening and false reports of explosives . CNN 's Elwyn Lopez and Janet DiGiacomo contributed to this report .
Authorities say Leeland Eisenberg is not at his New Hampshire halfway house . He was charged with murder in the death of a woman who died after being beaten by her husband and children on Saturday night. After an early release from prison , Eisenberg violated his probation in 2010 .