FAIRBANKS—A sealed court document obtained by the Daily News-Miner corroborates some details of an alternate account of the 1997 John Hartman murder but also clashes with key aspects of the 2012 statement that is being presented as a confession by one of the teen’s true killers.

Since their convictions in the late 1990s, the four men convicted of murdering 15-year-old Hartman have maintained their innocence and tried to win exoneration. Three of these men — Eugene Vent, Kevin Pease and George Frese — remain in jail. The fourth, Marvin Roberts, was paroled this year.