Leonel Herrera is scheduled to be executed in Texas on 12 May 1993. He was convicted in 1982 of the murder of two police officers. In 1992 his lawyers presented new evidence alleging his innocence. However, the US Supreme Court dismissed his appeal in January 1993. The court ruled that the evidence presented in support of his claim of innocence did not entitle him to federal habeas relief. This paper gives a summary of Leonel Herrera’s case and presents AI’s concerns regarding the Supreme Court ruling in the case.