Grotto Pizza Delaware locations will donate 20 percent of revenue from open to close May 15 to the Delaware State Troopers Association Stephen Ballard Memorial Fund, of fallen Cpl. Stephen Ballard.

Ballard was gunned down on duty in a parking lot in Bear on April 26. The memorial fund will help his wife and 5-year-old daughter.

There are 12 Grotto Pizza locations guests may visit to help with the fundraiser: Wilmington at Pennsylvania Avenue and Concord Pike locations, Newark, Middletown, Dover, Milford, Long Neck, Grand Slam Lewes, Rehoboth Avenue, South Boardwalk Rehoboth and Seaford. The 20 percent will include dine-in, takeout and delivery orders.

For information, visit grottopizza.com.