This article contains plot spoilers for the 2017 series of Twin Peaks.
When Cooper arrived at the meeting place, he was covered in blood. Chantal saw to his condition and after making a phone call to Duncan Todd, he gave her and Hutch orders to kill Warden Dwight Murphy. She sent him off with a kiss (per her husband's instruction) before he left.
Chantal and Hutch waited in a van overlooking Murphy's home. Chantal insisted that she be allowed to torture Murphy before they killed him, but he said they were on a tight schedule. After Murphy arrived, Hutch shot him twice, killing him, and they left for a nearby Wendy's.