"I just can only hope that the criminal justice system will not be overwhelmed and persuaded by what is being put forth in the media. My fiance's fate should not rest in the court of public opinion, but rather in a court of law."
McAllister said she would cooperate with Markoff's attorney "as well as the Suffolk County district attorney's office as they both continue their investigation.
"I can only tell them what I know and what is the truth," she said in the statement. "I will expect that these discussions will occur within the next several days."
The statement Monday was McAllister's first comment on the case since she sent an e-mail to "Good Morning America" last week saying Markoff is "a beautiful person, inside and out."
ABC News has also obtained court documents in which Markoff, a medical student, pleaded poverty. The documents claimed that he has not received any financial support from his family for several years and that he is living off student loans that total $130,000.
In response, the court ordered Markoff's lawyer, John Salsberg, to defend him at the public's expense, the court documents state.
One of Markoff's alleged victims, Las Vegas masseuse Trisha Leffler, told CBS "48 Hours" Saturday that she survived an attack by Markoff and that after he tied her up and took her money, he stopped to take a memento.
"He picked up a pair of my underwear that were on the floor and put them in his pocket," Leffler said. Last week, investigators found panties belonging to two of the alleged victims in Markoff's apartment.