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The other six victims, all 30 or older, were in stable condition, Bouchard said. They included a husband-and-wife couple and a 78-year-old man.

The shooting happened just after 5 p.m. at a city park featuring a recreation area with a nonslip surface where people can turn on sprays and fountains of water to play in. Bouchard said the attack appeared to be random, with the shooter driving up to the park, walking to the splash pad and firing as many as 28 times, stopping multiple times to reload.

At least one witness reported that the shooter appeared to use two handguns during the attack, but that has not yet been confirmed, the sheriff said.

In the chaos, “people were falling, getting hit, trying to run,� Bouchard said. “Terrible things that unfortunately all of us in our law enforcement business have seen way too much.�

The gunman was “apparently in no rush. Just calmly walked back to his car,� the sheriff said.

Police heard the 911 call reporting the shooting as it came in, Bouchard said, because the agency uses a service that simultaneously sends emergency calls to first responders. An officer was at the scene within two minutes, he said.

Bouchard said the first deputies who arrived immediately began providing first aid, including tourniquets. Authorities found a handgun, three empty magazines and at least 28 spent shell casings at the splash pad.

Investigators used the handgun's registration information to obtain the suspect's likely address, the sheriff said. When police arrived at the residence they found a car matching the suspect's vehicle. Deputies surrounded the home and tried to make contact with the suspect inside, to no avail, Bouchard said. They sent a drone inside the home and then entered to find the suspect was dead.

Bouchard said the man died of a self-inflicted gunshot wound. Deputies discovered a handgun next to the body that may have been the second weapon the witness saw, the sheriff said.

Deputies also found a semiautomatic rifle lying on the kitchen table, Bouchard said. The quick containment of the suspect may have prevented a “second chapter� to the shooting, the sheriff said.

The suspect did not live in Rochester Hills and investigators do not yet know why he went to the splash pad, according to Bouchard.

Officials did not release the man's name. Bouchard described him as a 42-year-old man and said officials believe he lived with his mother. The man’s mother was notified, Bouchard said.

The man had no prior police contacts and no criminal history, Bouchard said.

“It's our understanding that he was undergoing some mental health challenges but no one that we know of was notified,� the sheriff said. He did not elaborate further on the suspect's mental health history.

The sheriff said investigators plan to search for any writings that the shooter may have left behind as well as dig into his electronic devices to piece together a motive.

“In terms of the ‘why,’ I don’t know,� Bouchard said of the gunman’s motive.

Rochester Hills is about 15 miles (24 kilometers) south of Oxford, where in 2021 a 15-year-old .

“I love my community and my heart breaks today,� Rochester Mayor Bryan Barnett said. “When I got on scene I started to cry because I know what a splash pad is supposed to be. It's supposed to be a place where people gather, where families make memories, where people have fun and enjoy a Saturday afternoon, and it wasn't today. It's a mental reset and a reminder we live in a fragile place with fragile people."

Saturday's shooting came at the end of the first full week of summer vacation for students attending Rochester Community schools.

Bouchard called it “a gut punch� for the county.

“We’ve gone through so many tragedies,� the sheriff said. “You know, we’re not even fully comprehending what happened at Oxford. And, you know, now we have another complete tragedy that we’re dealing with.�

Michigan Gov. Gretchen Whitmer said on the social platform X that she was heartbroken to learn of the shooting and was in touch with local officials.