Lake County authorities could add charges against Gary Nelson of Round Lake Park, charged with two counts of aggravated driving under the influence, after the death of a woman who was a passenger in his car.

"We anticipate an upgrade from the existing felony driving under the influence counts after the Lake County state's attorneys review the new developments of the case," sheriff's Lt. John Jansky said Thursday.

Danielle Toal, 23, of Bristol, Wis., was pronounced dead at Aurora St. Luke's Medical Center in Milwaukee at 1:18 p.m. Thursday. She had been in the hospital on life support since Sunday after she was airlifted to the hospital after suffering a broken neck.

"She was a very loving and caring person who saved lives, even on her last breathe," said her sister, who did not want to be identified, in a telephone interview.

According to family members, Toal had an organ donation sticker on her driver's license directing donation of all of her organs after her death. According to family members, Toal died on the scene, but was revived by Antioch paramedics.

Toal was a passenger in car driven by Nelson, 59, who faces a pretrial hearing today on the current charges.

Nelson's 1993 Ford Escort collided with Kimberly Casteel's 2005 Ford Focus before 6 p.m. Sunday on Route 173 near Eagle Ridge Road. The Escort crossed the center line, colliding with Casteel's vehicle. Casteel of Harvard was treated at the scene by emergency medical personnel and released.

Emergency crews had to work to remove the three passengers from a flooded two-feet-deep marsh where Nelson's vehicle stopped.

Nelson, who was driving on a revoked Illinois driver's license, was taken to Condell Medical Center, Libertyville, for treatment and then sent to Lake County court and booked.

The Escort was registered to 37-year-old Timothy Allen Gaines of Round Lake, and there was no insurance coverage on the vehicle, authorities said.

Nelson's other passenger, 23-year-old Corey Cloos, was taken to Vista Medical Center East in Waukegan for treatment of minor injuries.

In addition to operating with a revoked driver's license, Nelson's Indiana commercial driver's license had also been suspended.