PHOENIX — As the word “guilty” filled the silence of a Phoenix courtroom, defendant Michael Marin closed his eyes, put his head in his hands and appeared to put something in his mouth. He then took a swig from a sports bottle.

Minutes later, the 53-year-old Marin was dead.

Additional Photos

In this undated photo provided by the Maricopa County Sheriff's Office, 53-year-old Michael Marin is shown. The former Wall Street trader and attorney is suspected of fatally poisoning himself as he was found guilty of arson of an occupied structure in a Phoenix courtroom on June 28, 2012. (AP Photo/Maricopa County Sheriff)

Now investigators are trying to confirm their suspicion that Marin popped a poison pill after the jury found him guilty of arson, a bizarre ending to a case that began in 2009 when he emerged from his burning mansion in scuba gear.

Prosecutors said he torched his home when he couldn’t keep up with the payments. Marin, an attorney and father of four, faced seven to 21 years in prison.

“This is one of the strangest cases I’ve seen in a long time,” said Jeff Sprong, a spokesman with the Maricopa County sheriff’s office. “We’re hoping to find out exactly what he was thinking and exactly what he took.”

Detectives will get the liquid from the sports drink tested for poisons. An autopsy was being conducted Friday to determine if any poison was in Marin’s system, but results weren’t expected to be released for months.

Marin’s four grown children, who live in Arizona, did not return requests for comment, nor did his attorney, Andrew Clemency, or prosecutor Chris Rapp.

Marin, a former Wall Street trader, had summited Everest and wrote on his Facebook page that he had scaled six of the world’s seven tallest mountains. He also was an art collector who had original Picassos.

Prosecutors painted him as a desperate man who had $50 in his bank account in July 2009, down from $900,000 a year earlier. He also had a monthly mortgage payment on the mansion of $17,250 and an upcoming balloon payment of $2.3 million.

Marin also owed $2,500 a month on a different home and owed $34,000 in taxes, prosecutors said.

On July 5, 2009, Marin told investigators that he escaped a blaze in his 10,000-sqaure-foot mansion in a posh part of Phoenix using a rope ladder and wearing scuba gear to avoid inhaling smoke.

Fire investigators later determined that the blaze was intentionally set. As Marin was led off to jail, he told reporters that he was innocent and “utterly shocked” that he was being arrested.

On Thursday, a jury found Marin guilty of a felony count of arson of an occupied structure.

After the verdict, he appeared to put something in his mouth, according to video footage. Soon after, a bright-red Marin coughed, reached for a tissue, buried his face in his hands and appeared to sob, The Arizona Republic reported.

Marin then began making noises that sounded like snores and whoops as he began convulsing and fell on the floor face-first, according to the newspaper.

Sprong, the sheriff’s spokesman, said an investigator in the courtroom tried to resuscitate Marin. He was pronounced dead soon after at a hospital. Sprong said the department planned to interview his family and search his home.

Records show that other defendants found guilty of arson of an occupied structure, on top of other serious charges and when other people’s lives were at risk, have received more lenient sentences than the one Marin faced.

For instance, a Phoenix man was sentenced to 10 years in prison and three years’ probation after being convicted on charges that included arson of an occupied structure. Prosecutors said he endangered 12 people, including six children.

Franklin Zimring, a law professor at the University of California, Berkeley, who specializes in criminal sanctions, said a sentence up to 21 years in prison seemed overly long in Marin’s case.

“What makes the potential sentence both seem quite long and seem, in some sense, inappropriate is that the life that was put at risk was that of the offender,” he said.

Zimring said Marin likely would have been eligible for a shorter sentence had he agreed to a plea deal.

Jerry Cobb, a spokesman for the Maricopa County attorney’s office, said talks about a plea deal had broken down and the case moved to trial. He could not say which side was more responsible for the breakdown.

Cobb said that after Marin was convicted, prosecutors would have sought a harsher sentence for him, anywhere between 10 1/2 and 21 years in prison.

Among Marin’s last posts on Facebook, in November 2009, was a photo of his four children that said there was something more important to him than his Everest conquest.

“More than anything else I may have accomplished in this life, this is what really matters to me: the blessing of knowing the amazing individuals I am privileged to call my children,” he wrote.

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