The One Longfellow Square performance venue in Portland will offer free showings Monday of two movies featuring Robin Williams.

The venue will accept donations to benefit the Maine chapter of the National Alliance on Mental Illness. Williams, whose suicide this week shocked the nation and the world, suffered from depression and at times fought addictions to alcohol and drugs.

The showings begin at 6 p.m. with the children-friendly 1991 classic “Hook,” a retelling of the Peter Pan story. At 9 p.m., the 1997 film “Good Will Hunting,” for which Williams won an Academy Award, will be shown.