I know that some blogs are posting a later time that the movie ended, but it's best to go to the source for that information.
"The dead system confirmed that the last access (the system closed the program‛, is how Vice-Captain Trotta expressed it, on page 31, meaning that the closure‛ could be correlated as much to the human activity needed to stop the playing of the film, as to the natural conclusion with the scrolling of the end credits, a place at which the end of the film‛ itself would have undertaken a last interaction with the system, irrespective of the physical presence of a user), took place at
21:10:32 on the 1 November."
Motivation Report; pg 304
It was concluded by the judge and jury that movie simply stopped playing rather than some human activity turning off the movie or the computer.
The time of death, in my understanding, is somewhere between when Meredith returned home at 9 PM and as late as the last call from her father shortly after midnight.