Reconciliation of Past Sins If a person has murdered someone: ie. A fellow human being (eg. By directly attacking someone; or by indirect attack- by speech/action ; or by other means such as abortion) , what methods are available for such a person for personal reconciliation? It is inevitable that the Law of Karma is in direct effect, but how can such a person attain peace of mind and repay for his sins truly? Many patients I meet in surgery wards have serious past histories of attacking/assaulting others and murder is inevitable sometimes. Please offer your advice. It will greatly help me when consoling such persons in the future. 
Thank You!
Buddhism doesn't have the concept of sin. It's more of a concept of unskillful or unwholesome action (Akusala Kamma). There is no God to please. There is no "thing" that needs to be done to gain approval. What there is, is bad karma and that the person will experience that karma and the worsening spiral of those problems until they let go of the attachment that caused them to enter that karmic state in the first place. 

In my humble view, the best way to help someone caught in a difficult situation is to talk through the boundaries of the box they find themselves in. It's not the killing that's the problem. It's the "why" they killed that's the problem. Until the seed is removed, the plant can grow back again and again. 

They are the ones who have to break out of the box, but most don't realize they're in the box to begin with. Listening, compassion, time: Almost always the best medicine for tough karma.