PHOENIX — A former Wall Street trader who collapsed in court after being found guilty of arson and later died was found to have committed suicide with cyanide, according to an autopsy released Friday.

The Maricopa County medical examiner’s office toxicology tests showed Michael Marin, 53, had the poison in his system.

The report also noted an apparent suicide note e-mailed by Martin shortly before his death and cyanide found in his car afterward.

After he was found guilty of arson in June, Marin put his head in his hands and appeared to put something in his mouth. He then drank from a sports bottle.

Marin was not in custody during his trial.

Defendants who are not in custody and other people entering courthouses are not strip-searched, so it is possible to hide something like pills in a pocket or elsewhere on their person, said Sheriff Joe Arpaio, whose officers are responsible for custody of prisoners and providing security in courtrooms.

Court security personnel screen visitors arriving in the courthouses.

A court spokeswoman did not immediately respond to queries from the Associated Press.

Marin’s death was a bizarre ending to a case that began in 2009 when he emerged from his burning Phoenix-area mansion in scuba gear.

Prosecutors said he torched his home when he could not keep up with the payments. Marin faced seven to 21 years in prison.