Why is the ex Boyfriend not the defendant?

The cops faces all look like they know its a frameup.

And the ex-boyfriend had a key he wouldn't return? Cops caught in a lie going to let this guy's fate hang in the balance of a jury.

It seems like Lieutenant Sanchez doesn't really care about this Case. His Demeanor is I don't remember, I wouldn't know. What does he know? The Investigation was definitely not Complete by Any Means. There were So Many Other Suspects in this Case, that were glanced over or Never Interviewed at All. Neighbors, Boyfriends, her Political associations. Michael is the Least Likely Suspect based on No Evidence placing him Anywhere near her Apt. A Car-Petty theft thief doesn't just turn into a Random Killer. Her Death was Brutal and Truly a Crime of Passion.