Speaking from experience, losing a parent to natural causes is very tough for kids under the best of circumstances. I can't imagine how much more complicated it becomes when someone intentionally causes their death. That's not even getting close to the horror of people claiming your other parent was involved and puts that parent in jail. All those helpers in uniform we're supposed to look for when we're scared or in trouble? They put daddy in jail.
I can't remember who, but a man was interviewed several times during the OJ trial. His father had been charged with his mother's murder and much later acquitted, though he was left with serious doubts as to his innocence. He said the people who helped him most were those who respected his feelings and respected his grief and his coming to terms with the situation
over the years. Reading this article reminded me of what he'd said:
Life After Domestic Homicide
[Children] become both a victim-survivor and offspring of a murderer.
<snip>
Children need a rounded picture of their parents in order to resolve their own inner identity struggles. When a father, for example, has no redeeming qualities, the childs self image can be damaged because of the conflict inherent in trying to identify with the father. If daddy is bad, then half of me must be bad because half of me comes from daddy. These kinds of fears are common. Children worry that they may inherit the badness or sickness of the perpetrator. They may fear that they will end up like the parent who was killed or even that the perpetrator will come back to kill them too. ...
Children also have difficulties with attachment. Such difficulties are expected given the nature of the crime itself, the unresolved loss, and the aftermath of disruption. The dimensions of the attachment are also influenced by self image and the ambivalence over childrens post homicide identification with either the victim or perpetrator. Indeed, existing studies show that although many children have no discernible attachment problems, the majority have difficulty attaching at all or may be under-attached to their caregivers and, as adults, have trouble establishing and/or maintaining love relationships.
Much more at the link including a grandparent describing the very different ways the kids are dealing with the loss of their mother and their father being in prison.