The Associated Press 09/09/2024 03:46 OWYHEE, Nev. (AP) — The family placed flowers by a pair of weathered cowboy boots, as people quietly gathered for the memorial of the soft-spoken tribal chairman who mentored teens in the boxing ring and teased his grandkids on tractor rides. Left unsaid, and what troubled Marvin Cota’s family deep down, was that his story ended like so many others on the remote Duck Valley Indian Reservation. He was healthy for decades. They found the cancer too late. In the area, toxins are embedded in the soil and petroleum is in the groundwater — but no one can say for sure what has caused such widespread illness. Until recently, a now-razed U.S. maintenance building where fuel and herbicides were stored — and where Cota worked…