WASHINGTON COUNTY, WI (WHBL) - A man accused of killing his father in Washington County will get a mental exam to see if he’s competent to help with his own defense. 37-year-old Beau Musial, of Richfield, was charged Wednesday with first-degree intentional homicide. Prosecutors said Musial and his 76-year-old father, Jerome, argued about Beau’s purchase of a semi-truck – and then a few minutes later, Beau allegedly punched his father and slit his neck with a serrated knife seven or eight times. Investigators quoted Beau Musial as saying he was upset with his father and, “couldn’t take it anymore.” The two men lived together, and officials said the slaying took place at their home last Friday night. Beau Musial is being held under a 700-thousand-dollars. Results of his competency exam are expected to be reviewed at a court hearing on January 23rd.