Location: Reading, Mass.
The man who murdered referee Michael Costin over a rough play in a hockey game scrimmage had a history of violence. In addition to killing Costin, Thomas Junta was issued a restraining order after beating his wife Michelle in front of their two children and another kid in 1991. The following year, he was arrested for punching a Boston police officer. With all that on his record, it's surprising that Junta only served eight years in jail after it was found that he beat Costin into a state of unconsciousness in front of his children, Costin's son and several others.