Answer
Pierre Nkurunziza was the longest-serving president in Burundian history, serving from 2005 to 2020. He was a Hutu and a member of the CNDD-FDD party, which he led to victory in the 2005 presidential election. He was re-elected in 2010 and 2015, but his third term was controversial and led to widespread protests and violence. Nkurunziza died in office in 2020.