Garrett Foster was born on December 4, 1992 in Plano, Texas, to parents Stephen Paul Foster and Sheila Joyce Foster. Sheila describes her son as "one of the best men you would ever know." He was a compassionate friend, a loyal partner, and a vehement advocate for justice and equality. Growing up in a conservative suburb of Dallas, Garrett was not afraid of speaking out against racism, police brutality, and imperialism.
He met his lifelong partner, Whitney Mitchell, when they were both 17. They connected over a mutual love of music, and frequently attended Cochella, Afro-Punk, FunFunFun fest, SXSW, and ACL. After only a year of dating, Whitney developed a health condition that led to her using a wheelchair. During this difficult time, Garrett and Whitney's bond only strengthened, as he stepped up to support her in every way possible, and they spent everyday together.
Aside from caring for Whitney, Garrett also enjoyed playing tabletop fantasy games such as Warhammer and taking care of his pet Tegu "Betelgeuse". Eventually, Garrett enlisted in the military as a means of seeking financial security.