In U.S. district court, Leifson admitted to lying to a grand jury when he was questioned about the 15-year-old’s disappearance. Davis disappeared from Spanish Fork High School on May 2, 1995. Her body has not been found, though she has long been presumed to be dead.

Originally charged with 6 counts of perjury, prosecutors dropped five of the counts in exchange for his plea.

Leifson could face up to five years in prison for the one count of perjury.

In court, Leifson admitted to lying when he testified that he didn’t remember a heated confrontation between himself and Timmy Brent Olson, another defendant in the Kiplyn Davis case. According to the indictments, two people witnessed the confrontation, and Leifson also later admitted to participating in the confrontation to a witness who was wearing a wire.

Leifson is the last of five suspects to be tried on federal perjury charges.

Two men — Christopher Neal Jeppson as well as Olson — have already been convicted of perjury in federal court for lying about Davis’s disappearance. Both now face murder charges in state court.

Two other men charged with perjury in connection with Davis’s disappearance, Garry Blackmore and Scott Brunson, entered guilty pleas to lesser charges.

Olsen was sentenced to 12 and a half years in federal prison after being convicted on 15 counts of perjury. He is now awaiting trial in Utah County. Jeppson’s sentencing was continued until January.

Leifson’s sentencing is scheduled for January 10, and prosecutors say that the plea agreement will not require him to testify against Olson and Jeppson in the murder case.