PORTLAND, Maine — The trial of a Windham man charged with sexually assaulting a 4-year-old girl has started.

Nicholas Gladu’s trial on 68 charges including unlawful sexual contact and sexual exploitation of a minor started Monday in Cumberland County Superior Court in Portland.

The prosecutors said in opening statements that the 27-year-old Gladu sexually assaulted the girl between August and October of 2010 and that photographic evidence found on a digital camera card will be shown to the jury.

WMTW-TV reports that Gladu’s lawyer said the defendant has a history of mental illness and mental problems that affected his ability to determine right from wrong. Gladu has pleaded not guilty by reason of insanity.