Lana Domino is a friend of the Terry family and she says that no such letter has been received so far. She also noted that Holder never attended his memorial service but that President Obama had called the family and apologized.
I think Ms. Domino nails it on the head when she says,
“The only regret that Eric Holder has is that Brian Terry died and it opened everybody’s eyes to Operation Fast and Furious and it put it to a halt,” Domino noted.
UPDATE: I still agree with the sentiments espoused by Ms. Domino. However, it is now being reported that at least one member of the Terry family did receive Holder's apology letter before the Politico story.