From Abel to Zechariah

Martyrdom runs throughout the whole Scriptures, memorably referenced by Christ in His phrase "from the blood of Abel to the blood of Zechariah." What is the inner meaning of martyrdom? Is it just getting killed, or does it have actual theological purpose? Intro: 0:00 1st Half: 1:08 2nd Half/Callers: 1:22:24 3rd Half/Callers: 1:45:06 Conclusion: 2:54:00