Sorry to hear such sad news. Is the school planning some kind of memorial. When a student at my ds school died they had a little service. Some mentioned planting some flowers on the school grounds etc. Maybe you can reach out to the parents and tell them what kind of student he/she was etc. When my sister died I even asked the hair stylist what they talked about since she was one of the last ones to see her. Maybe your class could do a writing exercise and send a letter to the family etc. Hugs, prayers and PD. Also in our town 2 boys died tragically this way also but an adult was at fault speeding, etc. The kids set up a memorial and the town tore it down once, but the kids keep putting it up, flowers, pictures, christmas decorations, candles etc. I feel it is not an eyesore and this helps give them some kind of closure.