|Family|| Jennifer Jareau (mother)|
William LaMontagne, Jr. (father)
Henry LaMontagne (brother)
Unborn sibling (deceased)
William LaMontagne, Sr. (paternal grandfather; deceased)
Sandy Jareau (maternal grandmother)
Unnamed maternal grandfather (deceased)
Unnamed maternal great-aunt
Rosaline Jareau (maternal aunt; deceased)
Unnamed maternal great-grandparents
|Portrayed By||Phoenix Andersen (uncredited)|
|First Appearance||"The Job"|
In the wake of Kate's pregnancy, JJ informed Reid in The Hunt that she was pregnant with another baby and he could expect another godson or goddaughter, much to his happiness and surprise. Her pregnancy leads to her temporarily leaving the BAU on a maternity leave.
He later made another cameo appearance in the finale episode The Storm, in which he is being carried into the BAU's conference room by his father.
In Sick Day, Michael became sick while his mother was away on a case, leaving Will to take care of him alone.
- It was confirmed by Erica Messer that Phoenix will be portraying Michael in the same vein as his brother Mekhai, who is portraying Michael's brother Henry.