One thing I don't understand....If SM was "zooming" her friend....i.e. video interaction...why did they switch to texting?Yeah, I wish we knew the exact time of the conversation. The first time frame made sense when it abruptly ended at around 9:00 pm, and then 3 hours later was the activity on FB.
However, while Suzanne was texting with her friend, Barry still could have come home around 2:00 pm and had enough time to commit the murder before going back out again. If he went to the Fireplace store at around 5 or 6, that leaves about three hours that are unaccounted for.