GRANDVIEW, Mo. -- A collision between a pickup and two bicyclists has claimed a second life.

On Tuesday, police said Sierra Gaunt, 14, died as a result from injuries suffered in Monday night's collision. She is on life support pending organ donor arrangements, police said.

Gaunt's grandfather, 59-year-old Larry C. Gaunt, of Lee's Summit, Mo., died at the scene when the two bicyclists were hit by a pickup truck on Raytown Road near Harry Truman Drive.

Relatives said Larry Gaunt had ridden in the last 15 years of the MS 150 Bike Ride, and this year was going to be his granddaughter's first ride.

The two had just visited a local bicycle shop before the collision.

"He was very competitive. He rode hard -- he liked to be out front," said Chris Smedley with The Bicycle Shack. "A very strong rider for his age -- he could keep up with anyone. He could ride with the top groups in any club ride."

Smedley said Larry Gaunt had brought his granddaughter into the shop a few weeks ago to buy bicycle gear.

"Said he was getting her into the MS 150. He bought her a helmet and gloves," Smedley said.

Bicyclists often use the section of Raytown Road where the two were hit, Smedley said.

"The road usually has debris on it, so bikes will take the inside lane because the car tires keep it clear," Smedley said.

It's not clear why the pickup driver didn't see the two bicyclists. The collision remains under investigation.

Police said the driver, a 48-year-old Grandview man, was cooperating with officers. No charges have been filed.