PORTLAND (AP) — The trial of a Falmouth man charged with fatally shooting his mother has been postponed because lawyers were unable to select a jury out of a pool of more than 100 people.

Jury selection for the murder trial of 47-year-old Andrew Leighton took place Monday in Cumberland County court.

Defense attorney Robert LeBrasseur told the Portland Press Herald (http://bit.ly/1kdVQxW ) that he and the prosecutor exhausted a juror pool of 106 people without seating enough for a trial. He says picking a jury for a trial that involves mental health issues is particularly difficult.

Because of scheduling issues, the trial is now not expected to start until October.

Authorities said Andrew Leighton shot his mother, 68-year-old Shirley Leighton, after she tried to have him committed for psychiatric care.

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