Two visitors apparently drowned in two separate incidents on Kauai over the weekend, police said Monday.

At about 4:45 p.m. Saturday, Michael Stone, 72, of Boston, was observed swimming about 30 yards offshore  of Plantation Hale Suites in Wailua.

Police said he appeared to be in distress and signaled for help when Stone’s friend and another person responded and brought him to shore.

Firefighters arrived and administered CPR until medics transported him to Wilcox Hospital, where Stone was pronounced dead.

At about 3:40 p.m. Sunday,  David Deville, 48, of Arizona was snorkeling off Mahaulepu Beach in Poipu when he began showing signs of distress, police said.

Two  people brought him to shore where fellow beachgoers including a retired lifeguard and an offduty nurse administered CPR.

Firefighters arrived and continued CPR until medics arrived. Police said he was transported to Wilcox Hospital and pronounced dead shortly after.

Life’s Bridges, a grief counseling service, is assisting family members of Stone and Deville.