Any person convicted of any act, or attempt to commit the act, of murder, rape, robbery or assault with a deadly weapon, the commission of which directly and proximately resulted in serious physical injury to another and the commission of which follows within five years a previous conviction of another felony, or attempt thereof, resulting in serious physical injury to another, shall upon conviction serve such sentence as may be imposed without benefit of parole, notwithstanding any law to the contrary.
Ala. Code § 15-22-27.1 (1975)