January 11, 2007 -- All he had to do was close the door and dial 911.
But that's not what Brooklyn building super Raynold Voltaire did when he was awoken on a hot July night last year and told there was a kidnapped woman in his maintenance room.
Instead, he threw on some clothes and joined a savage gang led by a registered sex offender in raping and sodomizing the terrified college student.
"It's like the devil was knocking at his door," said one source familiar with the case. "And he answered it."
Yesterday, Voltaire quietly told a Brooklyn Supreme Court jury the entire sickening tale - pointing the finger at alleged ringleader Robert "Boo" Kelly, 42, in return for an 8-year prison deal.
"He said he was using my maintenance room," said Voltaire, 34. "He had a 'freak' there . . . I said, 'Hold on.' I put my pants on and I came out."
When he got there, Kelly - a registered sex offender and two-time felon - was already raping the woman, whose name is being withheld by The Post.
Kelly's lawyer ripped into Voltaire in cross-examination, suggesting he implicated his client to save his own skin.
"You're the superintendent of this building!" thundered the lawyer, Kleon Andreadis. "You've got responsibilities, don't you?"