Danny O'Neil of 710 ESPN Radio Seattle first reported their absences.
Tammy Meyersonpassed away Friday in Miami. According to her obituary, she "loved and mentored Jimmy Graham as a son."
Graham tweeted a remembrance Tuesday morning before her funeral.
Bennett has said he is seeking a change in his contract status. Bennett signed a four-year, $28.5 million deal in March 2014 that has $16 million of guaranteed money, but he wants to be paid among the top defensive ends in the league.
According to the 710 ESPN Radio report, the team knew about all the absences Tuesday except Bennett's.
Wilson's absence leaves the Seahawks with only two quarterbacks at the OTAs in B.J. Daniels and R.J. Archer, neither of whom has taken a snap in an NFL game. Veteran Tarvaris Jackson, who was the backup quarterback last season, is a free agent.
OTAs are voluntary team workouts. Tuesday's session is the first of three OTAs this week.