A Mason City man has been sentenced to up to 50 years in prison in connection with the death of his 19-month-old son. Judge Gregg Rosenbladt sentenced 30-year-old Kenneth Adams on Friday to up to 50 years after his conviction of child endangerment resulting in death. Adams was arrested after the death of his son, Owen, last fall. Prosecutors say Adams put the boy face down in a pillow to try to calm him during a temper tantrum, cutting off his breathing. The judge says Adams' sentence could be reduced for good conduct and credits earned by prison work.