Rescuers assisted him through the lead-induced seizures and, for a while, they expected him to heal. Unfortunately, the lead had already done too much damage and, on Wednesday night, River lost his life.
But, River is not alone. Lead poisoning is a common hazard to birds of prey.
Hunters may choose to purchase lead bullets, because they're cheaper and, in some cases, safer than other materials. But, occasionally, these bullets end up killing more than just the targeted animal.
"Animals like eagles and other birds or prey at the top of the food chain ... eat animals that have lead," the rehabilitation specialist's son told KWWL. "It accumulates in their tissues and can poison them, it's a very powerful neurotoxin."