Preserve the video before the retention cycle overwrites it, and confirm in writing that the system has been suspended. This is the single most time-critical action and it is routinely missed.
Issue a litigation hold covering the clinical record, the incident file, staffing and assignment records for the shift, equipment maintenance records, the training file for the staff involved, and internal communications about the resident.
Record the names and contact details of every person on duty, including agency staff. Turnover will make them unreachable within months and they are the witnesses.
Report it. On a claims-made program, an incident meeting your notice standard should be noticed as a circumstance, which fixes the responding policy year even if the demand arrives three years later.
Do not alter or supplement the chart. Late entries are permissible when made and dated properly, but any change after a demand letter will be characterised as fabrication regardless of intent, and electronic records carry audit trails that make the timing visible.
Talk to the family, promptly and in person. The most common reason a family retains counsel is that nobody explained what happened.