Grief Support Groups – Any recommendations?

My dad passed away three weeks ago, and I think it would be helpful for me to attend a Grief Support Group. We worked together on the same team, so I'm having a little trouble getting away from it at all and felt it would be nice to talk with people who are going through the exact same thing as I am.

Does anybody have any recommendations on groups? I live in Greenway Plaza, so somewhere close-ish to that would be great. Believe me, I googled, but there are a LOT of options.

Thank you in advance for your help.