DENVER -- A 14-year-old girl was arrested Tuesday afternoon for her alleged involvement in a fatal hit-and-run watercraft accident at the Chatfield Reservoir.

The Jefferson County Sheriff's Department said that thanks to tips from Chatfield State Park rangers and other witnesses, they were able to track down the teen suspect who allegedly drove the red watercraft that struck a 9-year-old girl on Sunday.

Investigators said they located the 14-year-old suspect at her house in Lakewood and asked her to come in for questioning. She came to the Sheriff's Department with her parents at about 1 p.m. and cooperated fully, Jefferson County Sheriff spokeswoman Jacki Tallman said.

After the interview, the teen was arrested and faces a possible charge of criminally negligent homicide, Tallman said.

She was released to the custody of her parents because she was not considered a flight risk, 7NEWS reported. If found guilty she could spend 1 to 3 years in prison and pay a $1,000 to $300,000 fine.

Investigators said that they are still piecing together witness statements and have not closed their search for other suspects.

"We are still requesting anyone who may have seen something at Chatfield Reservoir on Sunday to please contact the sheriff's department," Tallman said. "We still need to locate the watercraft, locate the boat and ... put it all together and then we'll present it to the district attorney's office for some sort of recommendation on charges."

Allysa Jostad (pictured, above), the 9-year-old girl struck by the watercraft, was declared brain-dead Tuesday morning.

Jostad remains at Children's Hospital on organ support, which is different from life support, but keeps her organs viable until a suitable recipient can be for them, hospital officials said.

Jostad's parents said that they're very proud that their daughter is an organ donor.

Authorities had asked the public to help find the two teenagers who were riding the red personal watercraft that crashed into Jostad.

Investigators said that Jostad and her friend were being towed in a two-seat inner tube behind a boat on the west side of Chatfield Reservoir Sunday afternoon. At about 5:30 p.m., a personal watercraft traveling in the wrong direction tried to jump the wake of the boat, and collided with the two girls in the inner tube, Chatfield State Park officials said.

The two teenage suspects, Jostad, and her friend were all knocked into the water.

Jostad's 10-year-old friend was not hurt but Jostad suffered internal and head injuries.

After the collision, the two suspects got back on their red watercraft and took off towards Massey Draw beach, authorities said.

A man who may have been in the same group with the teenagers helped Jostad get back on the boat, operated by a family friend, and also took off towards the beach.

Police had been looking for that man, who was operating a blue or teal watercraft, and the two teenagers.

Authorities said that the teenagers were not obeying the rules and going clockwise along the shoreline when all motorized vehicles are supposed to go counter-clockwise. The suspects made a sharp left turn towards the beach, and that is when the crash occurred.

If you have more information about this case, you are asked to call the Jefferson County Tip line at (303) 271-5599.

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