The teen accused of fatally striking an autistic man in a hit-and-run on Sunday did not immediately recognize that he hit someone, according to an attorney.

Daniel Shirley, 18, of Hollywood, is charged with leaving the scene of an accident with personal injury and death. He surrendered to sheriff's deputies Tuesday and was released from the Charleston County jail in lieu of a $50,000 bail.

The charge was handed down in connection with the death of 22-year-old Forrest Carlton, Maj. Eric Watson said. Carlton was autistic, according to his obituary.

In an email, Shirley's attorney David Aylor referred to the accident as "a terrible tragedy for the family of the young man that passed."

"This is also a very unfortunate situation for my young client and his family," Aylor said. Shirley is accused of hitting Carlton around 3 a.m. Sunday as the man walked along Ashley River Road between Plainview Drive and Parsonage Road.

Shirley left the scene without helping the injured man, deputies said. Carlton died at Medical University Hospital.

According to Aylor, at the time of the accident Shirley was not aware that he struck a person.

"Had he known that, he would of stopped and called authorities," Aylor said. He added that a driver wouldn't usually expect a pedestrian to be in the road at 3 a.m.

Aylor said Shirley "swiftly" turned himself in to authorities when the details surrounding the accident came to light.

"This was a horrific accident for all that are involved and affected by it," Aylor said in the email.