My brother went to the NIU service last night with another brother's fiance. Andrea knows a girl who was sheilded from a bullet by her boyfriend. I believe that boyfriend was killed, not sure, but he was at least shot. They found comfort just being with each other and having the freedom to grieve and talk. It is going to take quite a while for them to process what has happened and feel "safe" again.
I liked the Martin Luther King Jr. story. I wouldn't force it but if there is an appropriate time, share it. They may not even be thinking about forgiveness at this time but it will come up.