(AMERICAN FORK, UT) – A Utah man has been charged with first-degree murder for the shooting death of his 5-month-old son. Twenty-one-year-old Joshua Petersen of American Fork allegedly shot his son Ryker in the head with a rifle before trying to turn the weapon on himself. A family member, who heard the initial shot, was able to stop Petersen from taking his own life. Police are unsure of a motive in the killing. Petersen is being held without bail.