ST. LOUIS (AP) – Nearly four years after a robbery in St. Louis, the case is now considered a homicide.

Christopher Dutton of Warrenton was shot while being robbed on Aug. 9, 2012. He died in March. The St. Louis Post-Dispatch reports that new autopsy results show he died from “pneumonia due to a gunshot wound to the chest,” and police now classify it as a homicide.

The suspect, 27-year-old Jonathan Leaks, was found guilty of robbery, assault and armed criminal action in 2014, and was sentenced to 30 years in prison.

The circuit attorney’s office is investigating to determine if additional charges should be filed.