Thanks. I hadn't seen that video before.
LINK.
Just to clarify, because I've seen it mentioned quite a few times now with puzzlement:
"they've dumped both the cell phones" means that they took a complete image of all the storage on the phones. Backed them up, basically, so that no info can be lost. I would assume phones is plural because they did both Sherri's and Keith's.
I'm not sure the statement "her cell phone connections went dead around noon," should be taken to mean the phone went dead.
I'm thinking he meant that they don't see any user input after noon. ie, no texts, phone calls, or app use.
He also says, "[the husband] ended up pinging her phone," which isn't quite an accurate way of saying what happened there, either. So what he is saying needs to be taken with a grain of salt.