The murder of Tristyn Tyne Bailey took place on May 9, 2021, on Mother's Day, in St. Johns County, Florida, United States.

On March 24, Aiden Fucci was charged as an adult and was sentenced to life imprisonment with the possibility of parole after 25 years.

At 1:45 am, a residential surveillance camera recorded two people walking east on Saddlestone Drive, strongly believed to be Fucci and Bailey.

Fucci initially claimed to have walked with Bailey along North Durbin Parkway until she turned onto Cloisterbane Drive to go home.

Noting that the distance between Absher and Fucci's home is a roughly thirty minute walk, investigators pressed for details.

[3][11] At this point, Fucci changed his story, stating that he and Bailey got into an altercation after she attempted to touch his private parts.

[11][12] After the interrogation, while in the back seat of a patrol car, Fucci took images and videos, publishing the imagery on the social media app Snapchat.

[14] A Buck knife with a missing tip found in the pond near her body matched a fragment lodged in Bailey's scalp.

During a press conference on May 27, State Attorney RJ Larizza said Fucci told his friends he was going to kill someone by "taking them to the woods and stabbing them".

Larizza also stated Fucci told his friends to expect [the murder] to happen within a month, and that Bailey was stabbed 114 times.

His mother, Crystal Smith, was arrested for tampering with evidence after washing blood off Fucci's jeans, but was later released.

[4][7][13] A police report released by the St. Johns County Sheriff's Office in July 2021 revealed that Fucci often spoke of his "fantasy" of killing people, that he often carried a knife with him, and that he planned to "drag a random person into the woods and stab them".

[4][18] During the impact statements at the trial, one of Tristyn's siblings, Alexis, dropped 114 aqua stone hearts into a glass jar one by one to represent the stab wounds her sister endured.