He stayed with his wife until the end and then gave her a burial in their backyard. However, it seemed that he and their children were immune to the disease.

When the 3rd wave hit, Oliver's wife was infected. With how chaotic things had become he felt that the wise choice was to hold up at home even after news reached them of the 2nd wave hitting the coastal cities. Oliver was quickly able to identify what happened as an EMP as he took Cassie home. They had to walk all the way back home through all the chaos that the EMP caused in the streets. When the 1st wave hit ten days after the Arrival, he went to Cassie's school to pick her up. At first, he debated with Cassie that the Others might be there to 'save' them. He and his wife decided to stay home and try to keep going about their lives like normal unlike a few other people around them were doing (running away, packing everything up, etc.) He explained that they didn't feel safe being in such densely populated towns but reasoned that they were as safe as anywhere for the time being. Oliver Sullivan was one of the people excited to learn about The Others when they first arrived. Oliver with his family watching the news about The Others Fifteen years from that moment, he would come to name his daughter after that constellation. The one that really had his eye was the constellation of Cassiopeia. He especially was taken by the constellations. As a boy, Oliver went on a trip to a planetarium where he lost himself at the display of stars.

Who plays evan in the 5th wave