BANGOR (AP) — The trial of a U.S. resident accused of mailing cyanide to a suicidal resident of England who killed himself is about to begin.

Sidney Kilmartin of Windham, Maine, faces federal charges of mailing injurious articles resulting in death, wire fraud, mail fraud, witness tampering and witness retaliation. The jury trial begins on Monday.

He has pleaded not guilty.

Investigators say Kilmartin advertised and mailed a substance he claimed was cyanide to several suicidal people. The substance was actually Epsom salt.

Prosecutors say Kilmartin mailed the real thing to 49-year-old Andrew Denton of Hull, England, to keep him from telling investigators about the fraud. Denton then used the cyanide to commit suicide.

Kilmartin has a history of mental illness and was previously committed to a psychiatric facility in 2008.

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