Mapp faces a maximum of 15 years in Florida State Prison.
Lee and another man robbed the victim in June 2018 at a Downtown park.
The crime took place in November 2016.
Williams now faces a maximum of 30 years in Florida State Prison.
With the indictments, each defendant faces a sentence of mandatory life in prison, unless the State provides notice of its intent to seek the death penalty.
Mitchell Ray now faces a maximum of 30 years in Florida State Prison.
Sentencing is scheduled before the Honorable James Daniel on Feb. 14, 2019.
Sentencing will take place in federal court on May 6, 2019.
The 32-page memo details initiatives each office has pursued while identifying successful solutions in other communities.
Sentencing is scheduled to be set the week of Feb. 11, 2019.