Charles, once expected to be a first round pick, slid to deep in the second last Friday.
Missy Meharg's squad will welcome two top-10 players as part of the class.
The forward's decision leaves the Terps' frontcourt depth thin.
Four Terps could be taken in the draft's late rounds.
A projection from Joe Lunardi has the Terps near the bubble.
“I’m hoping that this season is a turning point for the program,” coach Brett Nelligan said.
The Big Ten and NCAA tournaments were cancelled due to the coronavirus outbreak.
The Terps look to get back in the win column and clinch a share of the Big Ten title on Senior Day