She said: “I don't believe that he had anything that he shouldn't have had in his cell. I can tell you generally inmates don't sit naked in their cells with nothing to read and no clothes on.”

Cabral admitted that inmates like Markoff, who were not on suicide watch, are allowed to have safety razors, pens, and clear plastic bags, which they get when they make purchases from the prison canteen.

Law enforcement sources reportedly told NBC News that Markoff used his medical training to take his own life, stabbing himself in major arteries in the leg and neck with a pen before putting a plastic bag over his head.

Markoff was scheduled to go on trial in March for allegedly killing Julissa Brisman in April 2009 at a luxurious Back Bay Hotel, a woman he had allegedly met through the Craigslist website.

Markoff was also charged with robbing Trisha Leffler at gunpoint at a Westin Hotel in Boston on April 10, 2009. Leffler, of Las Vegas, was robbed of $800 in cash and $250 in American Express gift cards and was allegedly held at gunpoint and bound.

He was also facing charges for the attempted armed robbery of a stripper at a Holiday Inn Express in Warwick, Rhode Island on April 16, 2009.

The Sheriff revealed that the suicide was still under investigation but believed her staff did everything correct in dealing with Markoff.

From the nearly 10,000 pre-trial detainees who are booked into the Nashua Street Jail every year the average number of serious attempted suicides are 57.8 a year.