Sorry, there's no duty to rat or cop up an attitude as a civilian
And that’s from the bar, regardless of statutory language
If you have probable cause, you’d better subpœna the alleged witnesses if you want them “held accountable.” Otherwise there is not and cannot be any general duty for “witnesses” to “come forward” in court with their blouses unbuttoned to direct criminal charges to the district attorney’s office in order to “stick it to the man.”
Proposed Kathleen’s Law would hold those who know about violent crimes accountable
John Skidmore, a 25-year prosecutor who serves as the Alaska deputy attorney general for the Criminal Division, wrote in an Alaska Beacon commentary that “there is no general duty for citizens to report a crime or to aid law enforcement or the criminal justice system.”
Citizens and visitors in the State of Alaska generally may be expected to abide by the law, but they cannot be expected to take on any law enforcement or crime reporting duties themselves as non-law-enforcement-affiliated civilians or current or former military personnel.
We cannot be experts at minding other people’s business in Alaska, and we cannot be expected to take sides on reporting or criminal prosecution of other people’s actions.