"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 "could not hurt a fly" and that he is "a beautiful person, inside and out."
Markoff has been taken off a jailhouse suicide watch, but he is described as "extremely withdrawn," law enforcement sources told ABC News on Monday.
Markoff was assigned to a suicide watch shortly after his arrest last week in connection with the murder of Brisman. Correction officers put Markoff on a suicide watch after becoming alarmed when they found shoelace marks on his neck.
Markoff was removed from the around-the-clock surveillance, although a source told ABC News, "He is extremely withdrawn." Markoff is still wearing the paper clothing that he was given when put on a suicide watch.
The suspect broke down during a weekend visit with his family, telling his brother to "forget about [him]" and that "there's more coming out," ABC News has confirmed.
"It is unclear if he meant more victims or more evidence," a law enforcement official familiar with the visit told ABC News.
ABC News has also obtained court documents in which Markoff, a medical student, pleads poverty. The documents claim 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.
The emotional family visit Friday, first reported by the Boston Herald, was the first time the 23-year-old's family had seen Markoff since his arrest in connection with the murder of Brisman, a 26-year-old massage therapist.
One of the alleged victims, Las Vegas masseuse Trisha Leffler told CBS "48 Hours" Saturday 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.
Though Markoff's attorney, John Salsberg, said Markoff's family remains "very supportive of him," McAllister has yet to visit him in jail, and a bandmember who was scheduled to play at the couple's August wedding said the gig was canceled.
"The McAllister family contacted me late Friday evening and basically told me the wedding was off," Will Forte of the B Street Band said.
McAllister was not the only one coming to the former medical student's defense.
Sunday, ABC News received a statement from a close friend who said Markoff has been unfairly labeled "a murderer and a menace to society" by the media. The friend declined to be identified, at the request of Markoff's family.