Peter Van Sant

So deputies began looking at family members.

As it happened, the day Eric's parents were murdered was his 16th wedding anniversary.

That afternoon, Eric was helping his friend Mike Gens do some home improvement.

We were doing a tile surround on a shower, which, you know, the walls.

How late did you work that day?

I left there about 5.30.

When he left the job that day, where did he tell you he was going?

He told me he had to go get a plant for his wife for their anniversary and then they were going to eat.

Christine and Eric headed to dinner and later celebrated with friends.

Investigators also questioned Eric's son, Dexter, who was just 16 when his grandparents were killed.

Was it scary?

Deputies then turned to Eric's sister, Cindy, who had an alibi for that day.

And then I arrived home with the only vehicle we had.

Patrick is Cindy's husband.

Were you able to prove you were at home?

Then, while the family is in mourning, the case takes a shocking turn.

Four days after the Cola's body is discovered, Eric Cola finds a note in his mailbox.

What did the letters say?

Fixed you?

Yep.