Larry Chapel is a census taker and the brother of Dr. Evan Chapel, who has a daughter named Gwen, Larry was plotting with Evan to murder Gwen for a life insurance policy in her name, around the same time Evan was dating serial killer Nicole Wallace and planning to be engaged to her. Wallace was meant to be the patsy, so Larry and Evan could collect once Gwen died.
Wallace loved Gwen like her own daughter and decided to stop the brothers from killing her. Luring Larry to his usual ground in the projects, she killed him with a potassium cyanide injection under his tongue, then bashed his head once to made it look like an overdose that caused him to bump his head. She was briefly suspected of killing Evan's wife Monica and trying to kill Gwen, but Major Case found out the truth, and Wallace provided the evidence needed to arrest and convict Evan. Wallace escaped after leaving Gwen with her aunt in Arizona. (CI: "Grow")