Shannon was last seen in Baltimore, Maryland on March 3, 1984. She resided in the 2300 block of Foster Avenue at the time. She apparently climbed out of her bedroom through a window in the middle of the night and went to attend a party. She has never been heard from again. She left a note behind. Originally it was believed that Shannon had left of her own accord and gone to stay with her father or another relative, but now she is considered to be missing under suspicious circumstances. Shannon's mother received a letter from her on March 8, five days after she disappeared; it was postmarked Orlando, Florida. No one has heard from Shannon since then.