RedactedNarrative: V1 & V2 were traveling up river on the cedar river after they had put in at Ellis boat ramp.  V2 was in the lead traveling back & forth through the water in a playful manner. V1 was approaching V2 when he turned his head briefly & when he looked back forward, V2 was stopped approximately 10' away & in direct line with V1.  V1 hit V2 straight on which then caused V1 to continue forward & strike the victim on V2.  This caused back & head trauma to the victim & knocked him into the water face down & unconscious .  V1 was traveling approximately 20-25 mph.  V1 jumped into the water, made contacted with the victim, turned the victim over & waited for help.  Both subjects were wearing life jackets.
NameOfBodyOfWater: CEDAR RIVER
NearestCityTown: CEDAR RAPIDS