As we noted earlier this week, our joint "Post Mortem" investigation with NPR and FRONTLINE will be released on Tuesday, Feb. 1. Here’s a nearly 4-minute segment of the upcoming FRONTLINE documentary that will air in conjunction with A.C. Thompson's report and audio segments from NPR. California Watch's Ryan Gabrielson will publish additional stories later in the week. Please include #postmortem in any of your tweets about the video.

After the investigation has been published, the lead reporters on the project will hold a joint chat on Wednesday, Feb. 2 at noon Eastern/9a.m. Pacific to discuss their findings and answer any questions you might have. If you would like to participate, send an e-mail to postmortem@propublica.org and we’ll let you know how you can join the discussion.