DeMaio was charged with criminal attempted murder and first-degree assault of his wife, nutritionist Diane DeMaio, police said.
The couple had a dispute in their home at 261 Round Hill Road, which escalated to the point where Demaio assaulted his wife, according to the police statement.
She remains in critical condition at Stamford Hospital, police said.
Read the full "Greenwich Time" report here.
Read The Daily Voice's report on the initial incident here.
Click here to follow Daily Voice Greenwich and receive free news updates.