RedactedNarrative: Unit 1 was traveling west on Lake Murray. Unit 2 was traveling SE. Unit 1 was the give way vessel in a crossing situation and Unit 2 was the stand on vessel. Unit 1 failed to yield or give way to Unit 2 and both vessels collided bow to bow. Unit 2 is a larger boat and caused Unit 1 to rotate and capsize. Two occupants from Unit 1 were killed by blunt force trauma and the third passenger was ejected and sustained several lacerations. The operator of Unit 1 tested positive for alcohol and marijuana. The operator of Unit 2 passed a FST.