Kenneth Walker was at the site Sunday and identified the man who drowned as his younger brother. On Sunday, Hamilton would have turned 35 years old, Walker said. Hamilton is from the East Bay and had never visited Forestville before Saturday, but drove up with his girlfriend to celebrate his birthday.

Shortly after 5:30 p.m. Saturday, deputies responded to the Hacienda Bridge about 4 miles east of Rio Nido. According to witnesses, a man using a rope swing leaped into the river and failed to reemerge. Local firefighters, Cal Fire and a California Highway Patrol helicopter began searching the river for the man.

The Sonoma County Sheriff's Office responded on Saturday to the Hacienda Bridge in Forest Hills after receiving reports of a man who used a rope swing to jump into the Russian River and did not resurface.