He had not committed any crime or did not have any weapon. Police shot and killed him because he was reaching back in his car and the police thought he was reaching for a weapon.
I live in Houston and the natives are sure getting restless now.
There is no video I know of yet so I don't know if the police car had video cams.
http://www.msn.com/en-us/news/crime/man-shot-dead-after-police-chase-in-houston/ar-AAb42R5
http://www.chron.com/houston/article/Shot-fired-at-end-of-police-chase-6201525.php