Why did Urick lie?

We have numerous threads all the time about why did Adnan, Jay, Jenn, etc lie about this or that. My question is why did Urick lie or make up the story that Adnan murdered Hae and then called Jay at 2:35 or 2:36 to come and get him from Best Buy?

I'm not looking for it doesn't matter Adnan still could have done it later. The fact is Urick said this in the opening statements of the 2nd trial. Why? If it could have been done later by Adnan why would he stick to that time?

pg. 106

https://drive.google.com/file/d/0ByTc5P7odcLHZFg2WG5yc0xPNHM/view?pli=1