Update: The El Dorado County Sheriff's Office has identified the missing man as 29-year-old Alexander Ham from Vineyard.
The search for Ham was suspended Wednesday "pending further investigative leads," according to the sheriff's office.
FOLSOM -- The search for a man missing in Folsom Lake continued Monday.
Around 7:30 p.m. Sunday evening, a man was on the water when his jet ski capsized near the peninsula, according to Folsom Lake State Recreation Area superintendent Richard Preston.
"Choppy water, the boat might tip, you fly out," boater Ken Bueghly said Monday. "In this cold water, you won’t last very long."
The man who disappeared in the water Sunday night wasn't wearing a life jacket, investigators said. They believe the 29-year-old man may have drowned.
The man was on the water with a friend when the two of them briefly separated.
"When he came back and found him, he found the sea-craft, but not his friend," El Dorado County Sheriff's Office Sergeant Anthony Prencipe said.
As the search continues, investigators have a message for anyone heading out on the water.
"Swimming in this water, your muscles start to fail pretty quickly even if you’re a very strong swimmer, which is why we recommend really at all times, but especially now with the cold weather, to wear a life vest or some sort of safety device," Prencipe said. "Accidents happen but those can keep you alive.”
The man's identity has not been reported.
Stay with FOX40 for more updates as they become available.