Ironic. "Your honor, my client may have payed the murderer…

Ironic.

"Your honor, my client may have payed the murderer before the murder, but he also payed many other people and none of them murdered anyone!"

This is actually a perfectly reasonable argument. If my client is handing out money to everybody on the street, its not very suspicious that he handed out money to the murderer.

You have to go one step further and show evidence that the money handed to the murderer had something to do with the murder.

You're just skipping that fundamental step.