Having conducted many investigations over the last 19 years for law firms I can tell you that this is likely going to fall into the category of a wrongful death / premise liability case with the possibility of multiple defendants. Jack and those who are witnesses, it would be best to keep detailed notes of exactly what you saw, did and continued to do following the downed line. Avoid any speculation and refrain from adding any opinion to those notes. In addition, your phone records will be of interest. Those of you who witnessed the power line fall down and anything in between the time it fell and the tragic death occurred will likely be called up as fact witnesses if a civil case is filed at some point in time. Jack, if you know who was in the vicinity at the time it happened or anyone involved with the scene following it would be best to compile a list of names and contact information for those people as well. These cases can go on for years so keeping good notes now is paramount to see that your testimony is not questioned in the future.
Terrible and tragic loss for that poor fellow and his friends and family. Thoughts on Hole 1 will forever be changed.