Can the value of a person's life be lessened because of his or her actions?

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The United States constitution states that all men are created equal. This is logical. When we are born into this world, we are all helpless and naked babies. We have not yet accomplished anything and we all start life in the exact same shape and in the exact same way. At the start, our lives have equal value. However, is the equality of life maintained throughout our entire lifespan? Or can a person disrupt this equality and make their life less equal to other lives through their actions? For example, a man becomes a serial killer. He violates the equality of life by taking life from others. So because of his actions, is his life still equal to other lives? Or has he devalued his life? Is the murderer's life equal to a doctor's life? One kills and the other saves - is the life of the murderer equal to the life of the doctor? Or does the equality of all life hold throughout our entire lifespan, despite the actions we take? What do you think?