RedactedNarrative: Several subjects were riding four (4) separate jet skis.  Accident victim was third in convoy and apparently struck another’s' wake.  The subject then over-steered and over-powered jet ski.  This action caused subject to veer into the shoreline at an extreme speed.  The speed propelled jet ski and the operator onto shore, striking tree.  It is not apparent if the operator was thrown from the jet ski before or after striking tree.  Operator suffered a broken arm and bruised shoulder. Damage to jet ski was moderate.  