RedactedNarrative: On 07/23/23 at approximately 1700 hours, operator was operating a 1994 Bayliner BT on Lucky Peak Reservoir.  Operator and his fiancé were pulling four of their children on a tube behind the boat.  The tube flipped over and all four children fell into the water.  All four young children were wearing a pfd.  Operator observed one of the children was struggling to stay afloat and he jumped out of his vessel without a pfd in an effort to keep his daughter from drowning.
  
  Witnesses stated it appeared the daughter's life jacket did not fit well, which was causing her to struggle staying afloat.  Those witnesses jumped into the water to help all four children reach safety onto a vessel, but by the time they looked back to check on Operator he began to disappear under the water, drowning.
  
NameOfBodyOfWater: Lucky Peak Reservoir
NearestCityTown: Boise                         