|Family|| Unnamed husband (deceased)|
Jennifer Jareau (daughter)
William LaMontagne Jr (son-in-law)
Henry LaMontagne (grandson)
Unnamed daughter (deceased)
Unnamed sister (in-law)
|Portrayed By||Candy Clark|
Little is specified about Sandy's life, other than she had at least one other daughter besides JJ, who had killed herself, and that she is a widow, her husband having passed away from unspecified causes. She was mentioned in Season Four, where it is stated she had created a whole album full of photos of her grandson Henry.
In Run, Rossi calls her over to attend to her daughter's wedding with Will, loaning her her beloved wedding gown, which fits onto her with ease. Sandy walks JJ down the aisle during the wedding and then watches in pride as JJ and Will get married. Sandy later participates in the wedding dance and toasts to the happy couple.