The family says Niec works at Bronson Healthcare in Kalamazoo, and has US lawful permanent resident status.
ICE hasn't given a reason for the doctor's arrest, but the family believes he was arrested on the bases of misdemeanor arrests that took place when he was 17 - one of which was for receiving and concealing stolen property, the other for the destruction of property worth less than $100.
ICE did not respond to a request for comment about Mr Niec's case, and for clarification on how his history qualified him as a target for the agency. According to his sister, the second conviction was removed from his record because he made a guilty plea through the Holmes Youthful Trainee Act - an act created to help youth offenders avoid criminal convictions.
"It's shocking", Niec-Villaire, his sister, tells the Post.
Mr Niec, an internal medicine doctor at Kalamazoo's Bronson Methodist Hospital, moved to the United States almost 40 years ago when he was five years old.
Several doctors and colleagues have sent out letters of support for Niec following his detention.
"He is loving, caring and respectful".
Bronson Methodist Hospital, where he works, issued a statement Monday.
Niec has had other legal problems, but it's unknown if they affected his residency status.
Since 2007, Dr. Niec has been a skilled and caring physician, a valued employee and respected member of the Bronson medical staff. "The only danger I can see him on is when he's swinging his golf swing".
Simply a week ago, kindred MI occupant Jorge Garcia was isolated from his family at the Detroit Metro Airport and ousted to Mexico regardless of paying his charges and living in the nation for about 30 years while never carrying out a solitary wrongdoing.
His wife, Rachelle Burkhart-Niec, said: 'We need him here, and we're lonely without him.
'These days there's less discretion being exercised in who they go after, they're being more aggressive, generally speaking, ' he said. "They're being more aggressive, generally-speaking", Asch said. His family fears that even if he is allowed to stay in the US, the battle could take months. But those who love Niec are not interested in becoming examples. He's now being held in a Michigan County jail. "You did nothing wrong", Burkhart-Niec said.