Years ago I took a training with deborah spungen out of the antiviolence partnership of philadelphia sponsored by the federal office of victims of crimes
https://www.ncjrs.gov/ovc_arch...ts/ttac/fs000313.pdf
I have no idea if they are doing this anymore. At the time I was doing a lot of work with families impacted by homicide and the training was fantastic.
But it is really hard to listen to this material.
I also went to a meeting of the local chapter of parents of murdered children to get in touch with this group. Hard but excellent