I do not think Jo was killed in her flat.Probably not by anyone she knew.. I think there might well be a connection between Melanie Hall's murder, and also the young woman chef who was killed, Claudia ( forgive me, I don't remember her last name ).
I'm curious about Jo's smiliness as she entered the liquor store. Had someone outside spoken to her ? Paid her a compliment ? I wonder too how streetwise Jo was. Would she have realized she was being followed if this was the case ?
The boyfriend's alibi must have checked out. And besides, if he and Jo were having problems, I believe she would have said as much to her best friend when they spoke on the phone.... I don't think GR is the culprit. MOO
All JMO