This behind-the-scenes picture already indicated something like this and now we have the confirmation.
Via this EW Exclusive we learn that it’s
Time to meet Marty Deeks’ mom
Watch out for mama, Marty.
NCIS: Los Angeles is about to get a visit from Pamela Reed, best known for her stint on Parks and Recreation. EW has learned exclusively that she’ll play Mrs. Deeks, the mother of Marty (Eric Christian Olsen).
“It will come as a shock, but yes … Deeks does have a mother!” executive producer Shane Brennan tells EW. “A big moment for Kensi when they finally meet, a bigger moment for Deeks and another memorable NCIS: LA moment for the fans as we lift the veil — or in this case, the apron — on one of our much-loved characters.”
Read the whole article on ew.com.
Something I would like to have answered (other than the obvious ones):
How/when did Deeks stop being a “Brandel” and become “Deeks”? Did Mama Deeks remarry and he took his step-father’s name? Did Mama take back her maiden name?