RedactedNarrative: On September 8, 2018 at 1711 hours i, indiana conservation officer (ico) was notified by ico central dispatch of a boating accident. I later identified the individual involved in the boat accident. Based on the initial information that victim only sustained a black eye and minor scrapes during the crash i informed ico central dispatch that i would follow up with the investigation the following day. 
  
  On september 9, 2018 i went to elkhart general hospital to interview victim. At the hospital, i was informed that victim, in fact, sustained multiple skull fractures and brain hemorrhaging during the crash. Hospital staff notified me that he was undergoing several tests to determine if there were any underlying medical issues that may have led to the wreck. I was told there was no alcohol in his blood when he arrived at the hospital. Hospital staff continued saying when they talked to victim's wife, victim’s wife, she had informed them she had spoken with victim a couple hours before he wrecked and he sounded confused over the phone. I left the hospital without speaking to victim because he continued to receive medical attention. 
  
  On september 10, 2018 i returned to elkhart general hospital and was able to speak to victim and his wife, victim’s wife. During the interview, victim told me that he remembered fishing his way downstream past the bristol boat ramp. He continued saying he wrecked on the way back upstream towards his house; approximately one mile upstream from the boat ramp. Victim stated he did not remember stowing his trolling motor or starting his engine. He remembered being hit in the face by branches before waking up in time to crash. Victim said he believes he passed out or fainted which led to the crash. I asked victim if he had any pre-existing medical conditions that may have led to him losing consciousness. He informed me he did not know of any pre-existing medical conditions. The hospital tested for a possible stroke or heart attack and both came back negative. When victim regained consciousness, the first thing he remembered was being "crumpled into the shoreline" and his boat was pretty beat up. 
  
  Victim said his wife left the house around 1000 or 1100 hours in the morning and he left shortly after that to go fishing. He also stated that he only had a coffee and two donuts between when he left around ten or eleven until the time of the accident around 1700 hours. I asked victim if he was experienced operating a boat and he responded stating he has operated a boat since he was 20 years old (now 63). Victim also informed me that he did have an inflatable pfd on at the time of the accident as well as the kill cord, which cuts the motor if pulled. At the time i left the hospital, the cause of victim's loss of consciousness was still unknown. 
  
  After leaving the hospital, i went to victim and victim’s wife's resident where the boat was located. I identified the boat as a 2006 white starcraft with indiana registration number. I ran the registration through ico central dispatch and they confirmed that the boat belonged to victim. While looking at the boat, i observed extensive damage to the bow and starboard side of the boat. During my initial interview with victim, he stated that to the best of his knowledge, the boat was running well and there were no issues that would have caused the wreck. 
  
  On october 26th, i was able to make contact with victim’s wife over the phone. During our conversation i asked if the doctors ever discovered any underlying issues that led to victim losing consciousness. Victim’s wife informed me the doctors found out victim suffers from epileptic seizures. She continued saying there was a missed diagnosis at a younger age when doctors told victim he suffered from extreme migraines. Although victim does deal with migraines, the seizures were never discovered at the time. According to victim’s wife, when victim has these seizures, they are not the type of seizure that cause him to roll on the ground convulsing. Instead, she stated that he "acts as if he is in a trance" or zoned out. When he comes to, he needs help remembering what he was doing. Victim’s wife continued saying that the event leading to the accident caused transient global amnesia (tga) which is a sudden temporary episode of memory loss that cannot be attributed to a more common neurological condition, such as epilepsy or stroke. Victim is now being medicated for his seizures and he has returned to work full-time.