One cannot deny the additional anguish that survivors feel when the loved one dies a violent death, whether through accident, homocide, or suicide.
There are several factors involved in that.

One factor being the image that is left through witnessing, pictures, or imagination involved with the passing. Sometimes our loved one does not even resemble the person we knew anymore. Sometimes the final hours, however short may burn images into your mind. You cannot be told to forget it, that is nearly impossible. However the grieving person might need to be reminded that, in his or her memory, there are many positive images also. Acknowledge the painful picture, but also think about others as well. This can leave room for the entire relationship in memory rather than just the end.

Another factor in these passings is that generally they are sudden and unexpected. This adds another level of difficulty in grieving, since there is also emotional shock. In the case of a crime, there is also a level of overwhelming anger toward the perpetraitor. When the guilty person is not yet known, that adds yet another level of unresolved feeling. All of this needs to be expressed. Fixation on holding this in can lead to vengeful thoughts, emotional breakdown, and other things. Often this is also true of those who grieve a suicide. There are such a mixture of feelings, often guilt, sorrow, anger, all of which can be self punishing.

A workshop such as this is not at all adequate in meeting the needs of someone in these situations. Often, more help is needed, in the form of professional or pastoral counseling. Sometimes, temporary medication is helpful in short term coping, so consultation with a health care professional is also a good idea. These unthinkable situations with potentially searing real or imagined images can be overwhleming, but must be dealt with for one's own health and continued function.

Peace.