A Nashua man drowned while swimming in Sandy Pond on Saturday afternoon, authorities said.

Jay Coocen, 29, was pronounced dead at Southern New Hampshire Medical Center, police said. His last known address was 40 Chestnut St.

Coocen was one of two men swimming in the pond when he appeared to have trouble in the water and went under around 2:15 p.m. The other man made it to shore.

A police officer, the second male swimmer and a bystander went into the water and located Coocen, who was brought to the shore on the Pine Street side of the pond, where ambulance personnel were waiting.

Deputy Fire Chief Michael O’Brien said Coocen was unresponsive when he was pulled from the water, and emergency workers tried to resuscitate him.

“He unfortunately passed away as a result of the drowning,” police Sgt. Michael Fauteux said.

O’Brien said the pond, which is south of Route 111, covers about 3 to 4 acres.

Louise Vaysi, who lives on nearby Ross Street, said the pond is posted with “No Swimming” signs, and she doesn’t see many people swim there.

“That it’s dangerous, that they don’t realize it’s a dumpy pond,” she said. “It’s not a place to swim.”

She said it was “very sad” to learn a man had drowned there.