Apparently the CAG lived local to Joanna, so is it not possible she dropped the Pizza off on route & said she needed to pop back home for some reason or other ? Or did she stay at the CAG's place, have pizza, drink & then possibly get murdered after refusing his advances ?? He took her belongings back to the flat, including the bottle of cider to make it look like she made it home, but the truth is she didnt ?? Then the dumping of the body could of been anytime over the next few days ??