BRYAN COUNTY, OK -- A Bryan County man sentenced to prison for murder filed an appeal Tuesday.
Last week, A judge sentenced 25-year-old Marin Clay Allison to 19 years in prison for killing his infant son Ethan.
Allison was convicted of second degree murder in October.
Officials say Ethan died from a massive skull fracture to the back of the head while in Allison's care.
Prosecutors say Ethan's injuries were intentional.