A judge released Stephenson, 19, without bail late Sunday night after his arrest on assault, menacing and harassment charges. Prosecutors had asked for $7,500 bail.
Authorities say the confrontation occurred around 5 a.m. Sunday when the victim, Jasmine Williams, was returning home to her apartment building with two friends. Witnesses said Stephenson was waiting for her and yelled, “Are you kidding me?” before pushing her down the stairs.
Stephenson attorney Alberto Ebanks didn’t return phone and e-mail messages Monday.
Stephenson was one of the nation’s top high school prospects. He played one season at Cincinnati before applying for early entry to the NBA draft.
Bird said the organization was still waiting to hear all the facts.
Still, Stephenson “should not have put himself in the position he was in early Sunday morning,” the former Boston Celtics great added. “We have consistently emphasized to our players the importance of not putting themselves in situations where bad things can happen.”