That would be interesting - this is the first I've read about him using a bicycle...
A freeper whose name is something like doosee reported that yesterday or Saturday. Her daughter and her daughter's friend were jogging and a white male (40-50) bicylist passed them. They were about 3 miles from the Seven Corners area. They thought they saw a rifle butt protruding from his backpack. After the HD shooting they contacted the police with a decent description.
If doosee's name doesn't appear above, then I've got it wrong, but it's close.