Really?
Here are some tranistional fossils: (use the links in the article for more details.
List of transitional fossils - Wikipedia, the free encyclopedia
One of the latest important findings, Tiktaalik Rosaea
Tiktaalik roseae: Home
How can someone find a murderer when there were no witnesses (and the suspected lies)? By looking at the evidence left. We see today still the remnants of the past, in the fossil record, but also in the geographical distribution of species and in the genetic patern of now living species. Even in our own bodies we have remnants of evolution.
Etc. More to come later.
Even if these species actually existed, which is questionable considering the number of "transitional" fossil finds demonstrated in the past to have been fraudulent, they would prove nothing.
To demonstrate the gradual transition from even one genera to another, would require the finding of literally hundreds of transitional forms. not two or three, as even the best case scenarios contain.
The claim that structural, and even DNA similarities prove ancestral commonality can indeed be rationally argued. But such similarities can just as rationally be argued to demonstrate a common intelligent designer.
The only way to "prove" evolution is to start with the assumption that there was not an intelligent designer who created all this. Without this unprovable assumption, none of the evidence presented proves evolution.
To use your murder metaphor, the demonstration of even one plausible scenario that did not include the suspect, blows the entire case.
The existence of an intelligent creator is plausible to many, and implausible to others. but until you can logically rule out the plausibility of an intelligent designer, you do not have even the beginnings of a case. It all comes down to whose word you choose to believe. You choose to believe the word of scientists. But the recent flap over climategate has demonstrated to the entire world that "science" involves willful hiding of information that does not support the theory being advocated, and widespread attempts to silence the voices of opponents, even to the extent of successfully calling for the firing of anyone who dares to publish information contrary to their agenda. Those who have not been involved in the creation vs evolution debate were surprised by this evidence. But we active creationists were not. We have long witnessed, and been personally subjected to, this same prejudice and this same widespread attempt to silence our voices.
I had a university professor who publicly denounced me for openly stating that I did not believe in evolution, while privately confiding to his own lab assistant (who I happened to be dating) that evolution was actually not a very good explanation of the facts, it was just the best one they had.
My brother was taught the theory of recapitulation in beginning biology. In advanced embryology, he was taught that "actually, this is outside of the facts." The thing that particularly disgusted him was that in both cases, the professor who taught him these things was the same person! As a beginning student, this professor taught him that this proves evolution, and as an advanced student, the very same professor taught him that this was not true.
In my private studies, I ran across repeated calls to boycott certain publishers because they had published books questioning the theory of evolution. And I was personally required to sign a statement that I realized that I would be fired if I shared my faith with anyone even remotely connected with my employment. So I personally know that the pronouncements of "science" are not reliable.
But I find the word of God, the Bible, absolutely reliable.
. Anyway, I've spent a lot of time pouring over the actual scientific literature and the a priori assumption of universal common ancestry come before everything else in TOE. I'm a Young Earth Creationist based on two things, one is the New Testament witness confirming the special creation of Adam and Eve as our first parents. The second is the fact that the human brain had neither the time nor the means to have evolved from that of apes. 
