The Boulder County man convicted in the death of his infant son was arrested Monday on a $10 million warrant after he was allegedly seen with children at his girlfriend's home in Jefferson County.The warrant for Alex Midyette was issued for a bond violation. Prosecutor Colette Cribari said Midyette had contact with children at a house in Conifer, Colo. Midyette's arrest affidavit indicated he was seen over a period of several days at the home, described as belonging to his girlfriend. The woman runs a Montessori school out of her home, with as many as 12 children at the home.The affidavit said Midyette, 29, was observed interacting with several children at the woman's home.A neighbor told investigators she became curious after seeing what appeared to be a birthday party downstairs but a man was staying near a bedroom window upstairs. She said she watched him through binoculars and later identified him as Alex Midyette.One condition of his bond said the only children he could have contact with were nieces and nephews older than 2, and then only with family supervision.The arrest warrant was sealed and Midyette was taken into custody when he showed up at his weekly meeting with a Community Justice case worker in Boulder.Midyette was convicted last month of negligent child abuse resulting in death in connection with the March 2006 death of his son, Jason. He was out on a $1.5 million bond, pending his sentencing.Midyette's wife, Molly, is serving a 16-year sentence after she was convicted of child abuse in the same case.