
(n) First Degree Murder is the killing of human beings deliberately with a pre-plan while doing another crime, or felony etc. Ex. Killing the victim of the rape, killing the guard while looting the bank.
Found on
http://www.encyclo.co.uk/local/21213

Unlawful premeditated or wilful murder. 'Murder One.' (Note. The precise definitions and penalties vary in different countries and USA States.)
Found on
http://www.hemyockcastle.co.uk/money.htm

The intentional killing of another person by someone who has acted willfully, deliberately, or with planning. All murder that is committed with poison or by lying in wait is first degree murder.
Found on
http://www.nolo.com/dictionary/first-degree-murder-term.html
No exact match found.