Samy El-Goarany allegedly told his parents he was going to school in New York -- but instead flew to Turkey and crossed into Syria.
After leaving in January last year, the 24-year-old was killed in November. An unknown person later messaged his family with a photo of a handwritten note from him, court documents show.
"If you're reading this then know that I've been killed in battle and am now with our Lord InshaAllah," the note said.
" I want you to know how much I love you ... but I don't think words will ever be enough to describe it."