Murder on the Day of the Dead - S7-E5
Other mistake: The day of the murder was February 1st 2018, a Thursday, exactly as stated also by the answering machine early in the episode. When Jack checks out (really really late, while any investigator would have easily worked with that data right away, asking them to the provider even, together with the cell phone info) the victim's satnav, it says that her 1 PM trip happened "Sat", a Saturday. (00:04:50 - 00:34:55)