The incident occurred in Litchfield County at 5 p.m., Aug. 12, in New Hartford.
According to the Connecticut State Police, a Hartford County man, identified as Robert Holcomb, age 31, of Farmington, was found by troopers suffering from severe injuries on westbound Route 44.
He was rushed by ambulance to Winsted Health Center in Winsted, where he was pronounced dead, state police said.
State Police said a preliminary investigation found that Holcomb was headed west on a 2013 Harley Davidson when he lost control and struck the metal guardrail.
The crash remains under investigation.
Witnesses or motorists with dashboard camera footage who were in the crash area are asked to contact Trooper Tonny Vargas at 860-626-1820 or by email at tonny.vargas-diaz@ctgov.
Click here to follow Daily Voice Ridgefield and receive free news updates.