Counseling services are highly recommended for any family member coping with the traumatic loss of a loved one due to domestic violence. Counseling is especially important for children. The type of counselor you may need depends on your circumstances and individual situation. A guide to how to pick the best therapist for you may help. https://www.psychologytoday.com/blog/freudian-sip/201102/how-find-the-best-therapist-you
For referral services in your community, please try http://www.mentalhealthamerica.net/finding-therapy.