A man punched a sheriff's deputy and tried to grab the officer's handgun from its holster after a judge in Battle Creek convicted him of murder in the killings of his wife and son.Deputy Scott Eby pushed 43-year-old Michael Fisher against a wall Monday as others rushed to help. Fisher was subdued with an electric shock from a Taser.Calhoun County Circuit Court Judge Allen Garbrecht had just found him guilty of two counts of first-degree murder and other charges in the Dec. 28, 2006, shooting death of 38-year-old Candy Fisher and 12-year-old Michael Fisher II.