Williams signed a deal with the Wizards on Friday, according to NBA reporter Chris Haynes.
Okpara posted 12 points (6-13 FG, 0-1 3Pt), eight rebounds, two assists and one block across 27 minutes in Saturday's 91-83 Summer League win over the Hawks.
Watkins (knee) didn't play in Saturday's 91-83 Summer League win over the Hawks.
Beekman registered 13 points (5-10 FG, 1-3 3Pt, 1-1 FT), six rebounds, 14 assists and one steal over 31 minutes in Saturday's 91-83 Las Vegas Summer League win over the Hawks.
Okorie posted 27 points (8-19 FG, 1-5 3Pt, 5-5 FT), four rebounds, three assists and one steal over 28 minutes during the Pistons' 101-87 Summer League loss to the Heat on Friday.
Williams finished Friday's 101-87 Summer League loss to Miami with 15 points (5-8 FG, 1-4 3Pt, 2-2 FT), five rebounds, one assist and one steal over 25 minutes.
Trimble registered 24 points (8-12 FG, 2-5 3Pt, 4-5 FT), three rebounds, one assist, one steal and one block over 27 minutes in Wednesday's 108-94 Summer League loss to the Clippers.
Livingston logged 20 points (8-15 FG, 2-5 3Pt, 2-3 FT), nine rebounds and four assists over 31 minutes in Wednesday's 108-94 Summer League loss to the Clippers.
Watkins (knee) did not play in Wednesday's 108-94 Summer League loss to the Clippers.
Okpara (not injury related) has been ruled out for Wednesday's Summer League game against the Clippers, Josh Robbins of The Athletic reports.
