YNN has learned that the man accused of hitting a popular Fairport High school teacher with his motorcycle over the weekend was still on parole for felony drunk driving. He now faces manslaughter charges.

According to the Monroe County Sheriff's Office, 22-year old Mark Scerbo II is charged with second degree manslaughter and was arraigned in his hospital room Monday afternoon.

The State Department of Corrections confirms that Scerbo was released from the Moriah Correctional Facility just three weeks ago. Scerbo had served eight months at the facility, located south of Plattsburgh near the Vermont border.

Deputies say Scerbo was following his girlfriend, 23-year old Megan Merkel, on Route 250 in Webster Sunday morning. Investigators say Scerbo was riding motorcycle recklessly, and when he tried to pass Merkel on the shoulder, he hit 40-year-old Heather Boyum. Boyum, who was riding her bicycle, landed on the road, where deputies say she was then run over by Merkel's car.

Deputies say Merkel tried to leave the scene, and was later charged with DWI.

"She was out here doing something that she loved."

Heather Boyum was an avid biker, training for yet another triathalon, this time in Vermont. She was riding with a friend from the "Moms in Motion" organization.

"Someone who was reckless, under the influence possibly, took that from her and now her children don't have her in their life anymore and that's what's sad,” said Shawn Jackett, a fellow teacher in the biology department.

Monroe County Sheriff's deputies say around 7:45 Sunday morning, 23-year old Megan Merkel was driving her car North on Route 250 in Webster, while her boyfriend, 22 –year-old Mark Scerbo II drove his motorcycle behind her in a reckless manner, doing wheelies and speeding up to pass Megan's car.

Deputies say as Scerbo passed his girlfriend's car on the right shoulder, he struck bicyclist Heather Boyum, throwing her off her bike. Witnesses say she struck the roadway and was then run over by Merkel's car.

"She was a phenomenal person, great colleague; students loved her,” said Jackett, who worked with Boyum for five years. "She made a huge impact on her students. They were always coming back to see her. Students going to college for biology because of her."

Throughout the afternoon, students, past and present, visited the memorial site.

“She would offer to meet with you any time of the day, give up her lunch hour. She was outgoing, lively, and vivacious, always smiling,” said Taryn Treviso.

After only a few hours, dozens of notes were left, thanking their teacher for her hard work and dedication.

"I just think about every day before seventh period, I would stop by and talk to her, it was great. She knew a ton about me,” Treviso said.

Deputies say Megan Merkel attempted to flee the scene before she was later arrested for DWI. Deputies have not yet said whether the DWI charges will be a felony or misdemeanor crime. Meantime, Mark Scerbo remains at Strong Hospital with serious injuries.

Heather Boyum leaves behind her husband, a seven year old son and four year old daughter.