"Fireman." Includes any employee or member of a municipal fire department or volunteer fire company.
"Hijacking." Any unlawful or unauthorized seizure or exercise of control, by force or violence or threat of force or violence.
"Intentional killing." Killing by means of poison, or by lying in wait, or by any other kind of willful, deliberate and premeditated killing.
"Perpetration of a felony." The act of the defendant in engaging in or being an accomplice in the commission of, or an attempt to commit, or flight after committing, or attempting to commit robbery, rape, or deviate sexual intercourse by force or threat of force, arson, burglary or kidnapping.
"Principal." A person who is the actor or perpetrator of the crime.
18 Pa.C.S. § 2502