(CNN) A 70-year-old physician accused of cheating at this year's Los Angeles Marathon has died by suicide, officials said.

Dr. Frank Meza, 70, was found dead in the Los Angeles River last Thursday. The Los Angeles County coroner's office listed his cause of death as "blunt force traumatic injuries" and said the manner of death was suicide.

Last month, Meza clocked an astonishing time of 2 hours, 53 minutes and 10 seconds at the Los Angeles Marathon. It would have been a record for his age group.

But that record was thrown out after marathon officials said they reviewed security footage and showed Meza leaving and re-entering the course at different places.

Dr. Frank Meza had been disqualified from multiple races over the years.

Last week, Meza's widow said she didn't believe her husband would have taken his own life. But Meza's family did say he was under enormous stress over his disqualification and the cheating claims made in blog posts and media reports. And they believe he was treated unjustly.

"He was targeted, bullied and we tried to defend him the best we could," his daughter Lorena Meza told CNN on Friday. "He was so devastated that people could actually believe this."

How the race officials and others say he cheated

The controversy started after Meza, a retired South Pasadena physician and a longtime runner, finished the Los Angeles Marathon on March 24.

A pile of Meza's racing medals rests on a coffee table at home.

His 2:53:10 time across 26.2 miles -- averaging about 6:37 minutes per mile -- was extraordinary at his age.

The total time would have been more than a minute faster than the official world record for his 70-74 age group

As for his cohorts in Los Angeles that day, his nearest 70-74 competitor was more than an hour behind.

The result caught the eye of Derek Murphy, who runs MarathonInvestigation.com , a website devoted to calling out marathon cheaters.

In May, Murphy started posting information and photos suggesting Meza cut the course at more than one marathon, including the race in Los Angeles. One possible way to do this is to leave the course and re-enter it farther along, perhaps by using other transportation in the process.

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By June 28, Conqur Endurance Group, which runs the Los Angeles Marathon, announced it had seen enough.

"After an extensive review of original video evidence from official race cameras and security cameras at retail locations along the race course, Conqur Endurance Group has determined that Dr. Frank Meza violated a number of race rules during the 2019 Skechers Performance Los Angeles Marathon, including re-entering the course from a position other than where he left it," the statement reads

Math also came into play, the group said.

"Dr. Meza's actual running time for at least one (5-kilometer) course segment would have had to have been faster than the current 70-74 age group 5K world record," the group said.

That would have been "an impossible feat during a marathon," the statement reads.

But Meza denied he had cheated.

He told The Los Angeles Times he left the course to find a restroom, continuing down a sidewalk for a time before he found one.

"I didn't cut the course," he told The Times last week, days before his death.

This wasn't his first disqualification

Meza was disqualified from marathons twice before, The Times reported

In 2014, when Meza was in his mid-60s, the California International Marathon threw out his time of 2 hours 52 minutes because of unusually fast split times in the final miles, the paper reported.

The same race again disqualified him for irregular splits in 2016 -- and then banned him from entering again, The Times reported

Meza's marathon times had generally been dropping over the past 10 years -- from around 3:30 a decade ago to under three hours by 2014, The Los Angeles Times reported.

The disqualifications were confirmed to CNN by Danielle Domenichelli, spokeswoman for the Sacramento Running Association, which organizes the California International Marathon.

Meza had told The Times that when race officials approached him about those splits, he gave them no explanation.

"I don't run that kind of time," he said, according to The Times. "I actually told them, if you disqualify me, I won't protest. I don't want any doubts to be there."

MarathonInvestigation.com said Meza's marathon times had generally been dropping over the past 10 years -- from around 3 hours 30 minutes a decade ago to under three hours by 2014.

"I got better because I started running almost twice what I was used to," Meza told The Times . "I just increased my mileage."

The website writer and race organizers react to Meza's death

On Friday, Murphy posted a statement saying he was "deeply saddened to learn of Frank Meza's death."

"My heart goes out to his family and friends, and I wish for everyone to be respectful and to keep his loved ones in mind," Murphy's post said.

"There will be a time for comment and a broader discussion, but at this point, I feel that we should all allow those close to Frank the space to grieve."

Murphy declined to comment further when contacted by CNN.

Conqur, which runs the Los Angeles Marathon, also offered its condolences to Meza's family.

"We are deeply saddened to learn of the death of Dr. Frank Meza," the company said in a statement. "Our thoughts and prayers go out to his family."

The physician was a runner first, his widow says

Meza's widow, Dr. Faustina Nevarez, told CNN that the night of her husband's death was the first time she'd looked at the online allegations of cheating against him.

His family denied that he had cheated.

Meza's widow Dr. Tina Nevarez, daughter Lorena Meza, daughter-in-law Dr. Sara Tartof, and son Dr. Francisco Meza said they don't believe the 70-year-old cheated.

"He never cuts courses. He's the most honest man in integrity you will ever meet," Nevarez said.

Meza had been running since age 14, his relatives said, competing at Los Angeles' Cathredral High School.

The family said Meza first ran a marathon in 1980, and has run about 80 of them since. He'd also been an assistant coach with a high school boy's cross country team.

His son, Dr. Francisco Meza, said he would sometimes train with his father. He said the elder Meza would often clock 6-minute miles and run 100 miles a week while preparing for marathons.

"When he was doing time trials ... you can't keep up with him," the younger Meza said. "If I knew he was time-trialing that day, I wouldn't run with him, because it was" futile trying to keep up.

He planned to run another marathon with an observer, but he had heart trouble, family says

Meza's family said he planned to run the Chicago Marathon with an "observer" runner, in part to prove he could run well.

But Francisco Meza said his father recently had heart difficulties, including atrial fibrillation, and was expecting to undergo surgery.

"He wanted to come back after open heart surgery and prove them wrong," Francisco Meza said.

Still, he was exercising. When Faustina Meza last saw her husband Thursday morning, he told her he was going for a run.

"We'll have lunch," she recalls him saying before he left.

His body was found later that day.