He may have betrayed this woman.
She may be yearning for revenge.

But it does not follow that he killed Whitmore." "Why, what evidence is there to the contrary ?" weakly asked Greig.
"Why, the very murder itself," said Britz, as if stating an incontrovertible conclusion.
"I don't understand," the other admitted helplessly.
"We have two witnesses who stated that Collins openly threatened to kill Whitmore," pursued Britz.

"For four weeks, it is asserted, he went about seeking revenge on the man who, he believed, had wrecked his home.

It makes no difference whether Whitmore was a home-wrecker or a man of the utmost probity.

It was sufficient that Collins thought Whitmore was trying to destroy his home--that he wanted to marry Mrs.Collins.