Authorities investigating a deadly boating accident on Lake Lanier say they believe at least one of the boats involved was stationary at the time of the accident.

The Georgia Department of Natural Resources is still trying to determine what happened on Lake Lanier near East Bank Park on Suwanee Dam Road just after midnight Sunday.

The wreck killed Stephen Blake Jones, 59, of Duluth and injured three others.

It was the first boating-related fatality this year at Lanier, and a spokesman for DNR said the agency is still interviewing witnesses.

As of Monday, at least one new witness had come forward about the accident.

And DNR investigators say it appears that one of the boats involved was stopped at the time of the accident but could not confirm it.

According to a release by Gwinnett fire officials on Sunday, a husband and wife in their 30s were crossing the lake in a 21-foot ski boat when they reportedly struck an unknown object.

The couple then swam to shore to get help, climbing a bank to nearby Buford Dam Road and flagging down a passing motorist.

According to responders, the two were wearing life jackets when firefighters arrived.

Steven Parker, 32, and Ashley LeBlanc, 30, both of Cumming, were treated at a hospital in Forsyth County and released.

A search of the lake ended with the discovery of a second boat at about 5 a.m. in the Shoal Creek area near East Bank Park.

Rescuers found a woman on board, whom they later took to North Fulton Hospital in Roswell. At last report, the woman remained hospitalized in serious condition.