Police in Arizona are investigating whether self-poisoning may have caused the death of former Wall Street trader Michael Marin in a Phoenix courtroom on Thursday. “They are leaning towards that,” said Maricopa County Sheriff’s Office spokesman Jeff Sprong. “We cannot verify that at this point, and we’re not going to be able to until the toxicology report comes back in two weeks.” The 53-year-old former Wall Streeter was found guilty of arson Thursday. Marin was heavily in debt, and he quickly came under suspicion when his $3.5 million Phoenix-area mansion went up in flames in July 2009. In video of Marin taken minutes after the verdict, Marin claps his hands to his face and appears to “put something in his mouth,” Sprong said.