Often when one hears the word "death" - it is referring to a person, who has transitioned, from life. That is one type of death. In most dictionaries, they list more than one definition. This is also correct when studying the K J V..
When the LORD (Gen2:16,17) said You become intimate with Satan, you will surely die: it was a true statement, and he died. Mankind was created to last a long time. Methuselah, fell short, after 900+ yrs..
The instant "death" of the-man-Adam, and Eve, was separation between themselves, and the LORD. Immanuel-Christ-Jesus went to the Cross to mend this fracture, with HIS Blood.
When Apostle Paul (Rom chapt.5 & chapt.6) of "no longer being under the law" - He is speaking of Death (Satan) as well as the separation that entered in from the Garden (Gen2:16,17). The Cross of Christ is the bridge(Grace) Reconcile mankind and GOD: Period.
Any Minister that says "no longer under the law" Without the above explanation; run away from.
The third type of death, is physical: the absence of life, of life physically stops. Followers of Immanuel-Christ-Jesus know not to fear this because our(Holy Spirit + our spirit) will live on. The Kingdom of Heaven is inside us. "The sting of death" is gone, defeated. The LORD is Exalted: Amen!!!