William Bratton Backs Down

Who is William Bratton?
William Bratton was the chief of police of the Los Angeles Police Department (LAPD).  On June 19, 2007, the LA Police Commission reappointed William Bratton to a second five-year term.

Why is William Bratton Suspicious?
 "On August 5, 2009, Bratton announced that after nearly seven years he would be stepping down as chief of police for the City of Los Angeles."

He still had 3 years left, and he's backing down. Why? Notice that August 5th is still in the begining stages of the Michael Jackson investigation.Why would he be backing down during such a huge investigation? (Which the LAPD was involved with) :

"Although they did not immediately suspect foul play, by the day after Jackson's death the Los Angeles Police Department (LAPD) began to investigate the unusual and high-profile case"

So why would he just back down in the middle of an investigation? A HUGE one.

William Bratton's reason for resigning
"The chief says that when he came to Los Angeles, the department was a "troubled organization" in a "troubled city", but now is the "right time" to leave."

Toubled organization? What could they be doing that's so bad he considers them "troubled"?

Also, William Bratton's wife announced that she was leaving her job on October 30th 09. Why are they both leaving their jobs?