303. Persons suffering from diminished responsibility

Where a person kills or is party to the killing of another, he shall not be convicted of murder if he was suffering from such abnormality of mind (whether arising from a condition of arrested or retarded development of mind or any inherent causes or induced by disease or injury)

On a charge of culpable homicide amounting to murder, it shall be for the defence to prove that the person charged is by virtue of this section not liable to be convicted of murder.

A person who, but for this section, would be liable, whether as principal or as abettor, to be convicted of culpable homicide amounting to murder, shall be liable instead to be convicted of culpable homicide not amounting to murder under section 304(1).

The fact that one party to the killing is by virtue of this section not liable to be convicted of murder shall not affect the question whether the killing was culpable homicide amounting to murder in the case of any other party to it.