There are several resources on the home page of the Death Penalty Information Center, which is an activist and research center opposed to the Death Penalty.
There are other resources at Pro-DeathPenalty.com, which is an activist site also printing research in favor of the Death Penalty.
Here is a page with links to an audio recording of interviews with parents of the victim and parents of the executed person, on the day of execution.
Hearing both sides is worth while. Examining their research, assumptions, and methods is very interesting.
Gathering some experience through video or radio interviews is revealing.
