BETHPAGE, Long Island (WABC) -- Officials in Nassau County revealed new details on Friday about the owners of a deli in Bethpage who were stabbed to death this week .

Police say the victims were killed by their own son and they revealed that he has a history of violence.

Officers with Nassau County's Homicide Squad said there was an argument Thursday morning between a 30-year-old son and his parents at the deli where they worked.

Police say Vito Dambrosio went to the A &A Italian Deli on Hicksville Road a little after 9 a.m. Thursday.

His parents were both there working when police say Dambrosio got into a fight with his 62-year-old mother, Angela Pulisciano, and his 70-year-old father, Antonio Dambrosio.

Officials say he stabbed his mother and then turned the knife on his father.

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