Olympic eventer Amy Tryon died due to an accidental opiate overdose, according to the King County Medical Examiner’s Office (Wash.).

Tryon died on April 12 in her sleep at the age of 42.

The medical examiner ruled the death an accidental “acute combined opiate” overdose, according to a report from The Seattle Times. Toxicology tests found several drugs in her system at the time of death including Oxycodone, a semi-synthetic opioid used in pain killers, diphenhydramine, which is used in cold and allergy medications, and several benzodiazepines including Alprazolam, Diazepam, Lorazepam and Temazepam, which are sometimes used to treat insomnia or anxiety.

“She had her jaw dislocated on the Sunday before her death by a horse,” said her husband, Greg. “She’d had surgery to have both joints put back in on Tuesday. She took way too many of her muscle relaxants, plus the pain medication that she was on for the jaw, and apparently some other stuff as well. You couple all that together, and it’s a lethal combination. She was taking it as her management of the pain from the jaw. She wasn’t on that prior to that event. According to the medical examiner, it wasn’t the amount that was in her system, it was the different types. It was a poor choice on her part, and it had disastrous effects.

“She was tough; she was obstinate. She gave her all in everything she did. That was to her benefit and her downfall,” Greg continued.

He said Amy was feeling very positive before her death with two promising young horses in the barn and an enthusiastic barn staff who made the barn a fun place to work.

“Some friends in the horse world from both sides of the Atlantic were going to go to Africa on a safari with horses. When she came home from California the week before she was non-stop chatting about wanting to go on this safari. Those are the things we were planning,” said Greg. “She wasn’t a super hero. But she was an amazing person who had her faults and had her strengths like all of us. She just wanted to try and see if she could do it. We all miss her very, very much.”

Amy, of Duvall, Wash., represented the United States internationally for many years. She was a member of the gold-medal team at the 2002 FEI World Equestrian Games in Jerez, Spain, and the bronze-medal team at the 2004 Olympic Games in Athens. She won individual bronze at the 2006 WEG in Aachen, Germany. She balanced competing with her full-time job as a firefighter, and the Chronicle named her the 2004 and 2006 Eventing Horseman of the Year.