PBS claims that Annie Oakley died of lead poisoning. Although it may not have been confirmed, it is very likely that the death of Annie Oakley involved lead poisoning. Her career as an excellent shot and marksman performer brought her in contact with lead almost daily.
A common form of lead poisoning is lead shot that is eaten in meals of game meat and gets caught in the intestines. The slow leaching of poison into the body causes, illness and death.
We nearly lost the condor, and do lose many scavenger animals, to lead shot. Making it your business to use non-lead shot makes a difference.