Police said the 17-year-old was shot in Lake Hodge Park on Jan. 1, 2018.
Investigators said the teen was shot in the head around 8 p.m.
A 16-year-old girl and a 19-year-old man were also in the car at the time, according to investigators.
"His life was cut so short, who knows what kind of wonderful things he could've grown up to do and be," Williams' mother, Kim Crow, said.
At the time, police believed Williams and the others in the car were waiting at the park to meet some friends.
One of those friends told police he did not recognize the gunman or the people with him, according to authorities.
There is no known motive at this time.
Anyone with information about the case is asked to call Crimeline at 1-800-423-8477or email Detective Carrie Mims with the Casselberry Police Department at firstname.lastname@example.org.
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