 A White Bear Lake man has been charged in the death of his infant son earlier this year. An autopsy found the child died from complications due to head trauma. 39-year-old Mark Russell Forster was charged Monday with second-degree unintentional murder. The complaint alleges Forster was drinking and using marijuana while caring for his eight-week-old son in January. Later that day, the infant started seizing and was brought to a hospital. He died in March.