I married into this family.
Before I knew them, my husband’s brother killed their father, shooting him until he bled out, in hopes of getting the insurance money. It didn’t work out that way and he ended up in jail for about a decade (he was a minor at the time of the crime). At some point inside, he did a lot of soul searching and realized how wrong it all was. When he got out of prison, he was a changed man and even married a woman who had four kids by three fathers who were growing up as young hooligans in a trailer park, in hopes of raising them right. My mother-in-law stood up for him as “best man” at the wedding when no one else would.
I guess it depends on the murderer and the family involved. Is there any kind of remorse? Is he or she putting life straight? My bro-in-law built a house for his new family with his own hands, and the kids all seem respectable now – so something must have gone right. He hosts all the family “holidays” (Thanksgiving, Christmas etc) so we, as family, seem to be supporting our own.