mathiesen went to calm down the suspects as he approached the suspect as he approached the house. at that time, the suspect shot mathiesen twice. reporter: as he lay dying, according to officials, halloran grabbed the mother and tried to take her hostage in a car. but the brother got a gun and shot halloran dead. a justifiable homicide, it s called. deputy mathiesen s 21-year-old son vincent wanted to talk about his dad but family members warned him not to go on television. but he told me his dad was a construction worker for 28 years. finally became a sheriff later in life and loved it. he bought an old broderick crawford sheriff s patrol car just for fun. he was a great guy and loved to help people, his son said. that s how he lived and that s how he died. police say that halloran may be in a gang and some of his gang members may want retribution. that s why we re not mentioning his name. we will tell you that halloran had just gotten out of jail in the last several m