The woman is Vivienne Bellisario, Sean Murray's mother from a previous marriage.
She married the creator of NCIS, Donald P. Bellisario in Nov. 1998.
NCIS began in 2003.
Now we can be fairly certain as to how Sean got his NCIS role. Btw, Sean's brother Chad is a producer with the show.
I haven't been able to find Vivienne's birthday, but figuring she had Sean in 1977, she has to be at least in her 60's now.
After seeing that photo today on Facebook, my theory is this, SHE'S A FIRST COUSIN AND AN ILLYA GIRL! I'll be dollars to donuts this is how David landed his role on NCIS. This is my theory and I'm sticking to it!