Police investigating the still-unsolved murder of Chandra Levy are looking with renewed interest at Ingamar A. Guandique, who currently is in prison for assaulting two women at knifepoint in the same park where Levy's remains were found, The Washington Post reports.

Levy's body was found this past May 22 in Washington, D.C.'s Rock Creek Park, not far from the site of the two attacks.

Guandique, 21, was reportedly interrogated last year after the federal intern disappeared, but police essentially ruled him out as a suspect after he took a lie detector test.

However, police are now concerned with possible problems with the test because an English-speaking polygraph technician was used, and Guandique, a Salvadoran native, had his questions presented through a translator, possibly giving rise to a discrepancy in the test, say police.

Authorities wish to have Guandique submit to a second test, this time in Spanish, says The Post.

Police spokesman Sgt. Joe Gentile would not discuss details of the investigation, but did confirm that Guandique, who is now serving a 10-year prison sentence, is "someone we're interested in. No one has been ruled out."