Well, they should be able to figure out who the agent was.
In very close proximity to that lake is an area known as Val Verde. Back in the day (20-25 years ago) it was a hotbed for illegals and mexican gangs. It was pretty well known back then if you were of the pale persuasion, you stayed out of Val Verde. I don’t know what it is like today however.
A little bit of reading tells the story. The agent is alive and well.
Are you afraid to go back?