The cold-hearted cyclist left his wheels and fled on foot after the accident, police said.
When first responders arrived, the senior was lying in the road unconscious. He was knocked out of his shoes and lying in a pool of his own blood. The upended blue motorcycle lay about 100 feet away, witnesses said.
Lin was rushed to New York-Presbyterian/Queens with critical injuries, officials said.
“His right leg had to be amputated and he has bad bruising,” the victim’s son, Tom Lin, 43, told the Daily News. “He hasn’t been conscious.”
The motorcyclist is still being sought by cops.