It's the end of print media as we know it. The Boston Phoenix, an alt-tabloid known for gritty politics and arts coverage, will be shutting down after next week's issue, the paper announced on Thursday. The Phoenix had undergone a major reinvention just six months ago. The accompanying online radio station will also be closed. Its sister publication, in Providence and Portland, however, will keep publishing. "I cannot find the words to express how sad a moment this is for me, and I know, for you as well, so I won’t try," publisher Stephen Mindich said in a statement to staff.