From Halopedia, the Halo wiki
During the Covenant invasion of Earth, Jonas calmly gave away his kebabs to the crowd escaping from the city from his butcher shop on Obote Avenue. He had decided to stay in the city, as he realistically had no way to escape; he was too heavy to walk long distances and would take too many seats on a bus, train or boat. He claimed that he could take up to five seats in public transport vehicles.
In the panic created after the Solemn Penance arrived over the city, Jonas embedded his cleaver in an angry motorist's vehicle hood, and proceeded to use the newly-cut hood as a seat, arguing that the motorist's horn was frightening the nearby children. Sadie Endesha tried to convince him to leave the city, but he insisted that Sadie escape first, to find her father. She vowed to return for him with a forklift, but was never given the opportunity. Although his ultimate fate is unknown, he most likely died during the Battle of Mombasa.
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