[najida]

OK,
December 14th was a Friday.
The 15th was a Saturday and the 16th was a Sunday.

I doubt he could have killed her on the 15th at his house because not only would his wife be home, but well, lots of neighbors around etc.

My guess (and the time of day may help) is he chose a time on Sunday when Christine AND/OR the neighbors were not around, or at least thinner. As far as where was Marie....Idunno.

Unless Christine was in on it and they left Marie’s body in the garage until the time was good to bury her.

[IamHD]

"Unless Christine was in on it and they left Marie’s body in the garage until the time was good to bury her."

In the trunk of her car, maybe?