Michael McGlockton is convinced that two things killed his son in a Florida parking lot last month: The man who pulled the trigger and the state’s polarizing “stand your ground” self-defense law.

Markeis McGlockton, 28, died a few yards from his children and girlfriend at a store in Clearwater after a confrontation over a parking spot that reignited the debate over the law. The local sheriff said that under “stand your ground,” Michael Drejka was justified in the killing.