HELENA, Mont. - Motions filed in court to overturn the homicide convictions of two men in a 1994 killing reveal that a man serving a life sentence for a double murder told family members he was responsible for the killing and newly available DNA evidence links him to the crime.

The nephew and former sister-in-law of David Wayne Nelson told investigators that Nelson told them he kidnapped and killed Donna Meagher as she closed up a family-owned casino in Montana City in January 1994-- and that he has also bragged about killing people in four other states. Public court records do not include any information on the supposed victims in Florida, California, Nevada and Washington.

Tests on a rope found near the site west of Helena where Meagher was killed included Meagher's blood and DNA belonging to Nelson, the petition said. Nelson, 55, is serving a life sentence after pleading guilty to killing Bev Giannonatti, 79, and her son, Greg Giannonatti, 57, in Deer Lodge in October 2015.

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Prosecutors said Nelson, a handyman, stole and sold more than $26,000 worth of silver belonging to Greg Giannonatti and killed him and his mother when confronted about the theft. He dumped their bodies out of town, authorities have said.

Freddie Joe Lawrence, now 56, and Paul Jenkins, 64, were convicted of killing Meagher and sentenced to life in prison. A state law passed in 2015 allowed them to petition for DNA testing on case evidence.

Based on recent tests, the Montana Innocence Project is asking a judge to overturn their deliberate homicide convictions and release them from prison. A hearing is set for Friday in Helena. The state opposes the motions, which were filed earlier this year and unsealed last week.

Another unknown DNA profile was found on other evidence in the Meagher case, but no DNA belonging to Jenkins or Lawrence was found, The Montana Innocence Project argued.

The case against Nelson is still under investigation and no charges have been filed, the state Department of Justice said Monday. The state public defender's office said it had not been appointed to represent Nelson in any new cases.

Nelson's former sister-in-law and nephew told law enforcement officers twice before the Deer Lodge murders that Nelson had confessed to killing Meagher, court records said.