A motorboat striking rocks March 15 in Lake Lanier forced a Buford couple out of the vessel and killed a 29-year-old passenger, according to a Georgia Department of Natural Resources report.

The collision killed So Yang Kim and injured Young Tae Shim, 34, who rented a Monterrey open motorboat.

The wreck occurred around 8:10 p.m. on March 15, according to the report.

“(Shim) was sitting closest to the throttle behind the steering wheel as he operated the vessel left of center, in the Chattahoochee River channel, violating rules of the road, and struck submerged and exposed rocks located at channel marker C-30,” according to the report.

“This impact caused the vessel to abruptly stop in motion, rolling on its port side, turning of opposite direction, and flipping completely over on its top.”

Shim was ejected from the boat while Kim’s head was trapped under the boat, causing her to drown, according to the report.

Good Samaritans arrived more than an hour later to help and called 911.

Kim was pronounced dead on the scene by Hall County Coroner Marion Merck and Shim was transported to Northeast Georgia Medical Center.

Alcohol and drugs were not involved, according to the report.

Under the contributing factors, the report lists violation of navigation rule, no proper look-out and operator inattention.

According to the report, Shim had more than 100 hours of experience.

“The District Attorney’s Office in Hall County will determine if any charges will be filed on (Shim),” according to the report.

Shim did not immediately return a call seeking comment.