In 2008 in Florida, 16-year-old Maciel Martin Videla was killed for being an informant. News story here: Mother of murdered confidential informant sues sheriff’s office. The family’s suit against the Sheriff’s Office is based in large part on an undercover police officer’s admission that the murderer, Alfredo Sotelo-Gomez, told him (the officer) that he knew Videla was a snitch that he was going to “take care of him,” but the officer did not report the threat or warn Videla, who was killed the next day. Narcotics agent: Defendant promised to ‘take care of’ victim. Sotelo-Gomez was convicted yesterday of kidnapping and first-degree murder.
Videla was killed before the Florida legislature passed Rachel’s Law, see Florida’s Rachel’s Law provides some protection to informants, although that legislation would not necessarily have prevented the police from using Videla as an informant.