Alternately: We follow, in flashback, a private detective who is describing to the District Attorney the events leading up to "the murder of Mr. Boddy". Bob Boddy is shown to be a blackmailer and gigantic jerkwad... but it's his almost saintly brother, Bill Boddy, who gets murdered.
Alternately: (Continuing from the previous Alternately) ...And then it later turns out that Bill was the actual mastermind behind Bob's blackmail schemes, and forced Bob into many of his more jerkwaddish actions.
The victim was still a jerk, and he was only slightly exaggerating his personality.
The police decide not to prosecute, or even investigate, because the victim was such a gigantic jerkwad.
Alternatively, the police investigate the case only to congratulate or reward the killer.
Zig Zagged: The victim looked like a gigantic jerkwad, but he donated a lot of time and money to a charity... which he was using to funnel money back into his own pockets, but only so he could fund the Littlest Cancer Patient's surgery... and none of this is what got him killed: He was just in the wrong place at the wrong time.
Averted: The murder victim was clearly just in the wrong place at the wrong time (for example, a security guard who walks in on a robbery).
Reconstructed: The villain caused a situation where someone is to be killed. Out of remorse, he sets up so that he became the victim, so innocents are safe.
Yeah, officer, I wanted Asshole Victim dead, but someone else beat me to it.
Historical note: This was first page to be created in the Playing With/ namespace, since it was also used as the hypothetical entry during the YKTTW for Playing With Wiki. It was chosen because it was a straightforward trope that the author of the YKTTW was familiar with, having also been the author of the Asshole Victim YKTTW.