On a personal level, however, Grissom is a sullen, retiring man who doesn't relish the attention. Though he took a leading role during the First Contact War, in 2160, Grissom becomes a recluse on Elysium and refuses any interviews or contact with the Alliance media.
Mass Effect: Revelation
After the war, during his retirement on Elysium, Grissom's daughter Kahlee Sanders comes to him for help and tells him of the destruction of Sidon. Grissom hides Kahlee, tries to put Anderson off the case and guards the house with a shotgun by night. When Skarr arrives, Grissom tries to fight him off, but is caught in the krogan's line of fire. Grissom survives but refuses medical treatment to keep Kahlee hidden (a war hero showing up with gunshot wounds would have attracted too much attention). He then uses his connections to get Kahlee secretly off the planet, with Anderson to keep her safe.
Mass Effect: Ascension
The Jon Grissom Academy bears Grissom's name. Dr. Jiro Toshiwa's mention of her father (when her relation to Jon Grissom is classified and is only known in a document filed by Anderson) alerts Kahlee Sanders that Jiro is a traitor.
Mass Effect: Retribution
Grissom dies of natural causes in either late 2185 or early 2186, 6 months before the incident involving Paul Grayson.
Hundreds of dignitaries turned out for Grissom's funeral, including David Anderson. Kahlee Sanders, Grissom's daughter, attended as a member of the Jon Grissom Academy faculty in order to maintain the secret that he was her father.
A memorial plaque bearing Grissom's name and likeness was erected in the mess hall of the Jon Grissom Academy.