Dead man's justice

The woman: I killed this man because he deserves it. Nothing the police would do to make this an end.

"I, sir, Inspector, with all the respect, believe her."
"You can not see, it Sergeant, how can you not?"
"See what, sir?"
"The words she's planting in your head, Sergeant. She makes you a puppet of her, like she did to her husband."
"this woman has a family, she deserve all she has, and what her husband deserve?"
"A justice, Sergeant."