The four housemates had different times.
LW statement put the phonecall from an hour before.
My overriding point, if your partner makes a reference to killing his whole family over a long period and you believe it's bullshit you will mention it to your friends, especially your best one. She was a 21 year old girl.
In your opinion she would mention it. Neither of us met Julie or SB so can't say they would have said/not said.
The evidence Jeremy said 'you may hear from me later' is strong -
Julie says he said it
SB says Julie said 'we may hear from Jeremy later'.
Jeremy has never denied saying it.
Julie & SB did hear from him later!