Thomas Creech, 73, a serial murderer, was scheduled to be executed by lethal injection in Idaho. Prison management concluded that it was impossible to “give him an intravenous drip,” the prison administration said in a press release.

Ivan Cantu, 50, sentenced to death in 2000 and whose fate attracted the attention of celebrities, is awaiting execution Wednesday evening in Texas. Actor Martin Sheen, an opponent of capital punishment, urged people on Instagram to sign the online petition, which has already collected more than 150,000 signatures.