A state of mind requirement for murder. It is either an intent to kill or an intent to do an extremely dangerous act with a conscious disregard for the consequences.
Mental state required to prove murder.
Malice Aforethought is a 1931 murder mystery novel written by Anthony Berkeley Cox, using the name Francis Iles. It involves a Devon physician who slowly poisons his domineering wife to death so he may be with the woman he loves. The novel is a groundbreaking work in that it was the first in the genre to reveal the murderer's identity at the beginning of the story and grant the reader insight into the workings of a criminal mind.
Specifically in the criminal law, malice aforethought is the element of mens rea (Latin for "guilty mind") which must accompany the actus reus of death, in order to secure a conviction for murder under the common law.