SWAT team officers entered the single-family home and found the parents dead and the 2-year-old girl unharmed. The man was in an upstairs bedroom of the two-story house.
There are seven children in the family, but only four were home.
Police Assistant Chief Vince Demasi says there's no motive for what he calls "a very tragic and unfortunate situation."
Investigators haven't released the identities of the victims.
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