Here is a list of Bereavement groups in the area that may help you or have addition information. These groups are not SBS groups, however, they too have a similar mission and support those grieving the loss of someone who has died by suicide.
The Lantern: Meets every other Mon- 7:00-8:30 pm. To register - griefsupport@thelanternpdx.org
Alliance of Hope for Suicide Loss Survivors: https://allianceofhope.org/find-support/find-a-support-group/
Portland Hiking Therapy: In Office Sessions as well as Outdoor Hiking Sessions https://www.portlandhikingtherapy.com/suicidebereavement
Samaritan's Hope: https://samaritanshope.org/our-services/grief-support/