Minneapolis, MN (Learfield Wire Services) - A Brooklyn Park man has been sentenced to 40 years in prison for killing his infant son.

24-year-old Reggie Harper entered into a plea agreement with Hennepin County prosecutors this week and admitted causing the injuries that led to the death of 23-month-old Kazerion Harper in December 2014. Harper, who was scheduled to go to trial later this month, told the court that he became frustrated with the baby’s crying and punched the infant several times in the chest.

Hennepin County prosecutors say the baby's mother had obtained a restraining order against Harper because of incidents of domestic violence, but later allowed him back into her apartment.