Police have identified the man killed in a Columbia County crash on Friday and believe a medical emergency may have been the cause of the accident.

William Healy, 56, of Walden, was driving south on State Route 66 in Claverack near the intersection with Fish and Game Road, when he crossed the yellow line and struck a northbound tow truck, the Columbia County Sheriff’s Office said.

Healy’s vehicle went on to strike and break a Verizon telephone pole. The pole did not support any power lines. Healy was transported by Greenport Rescue Squad to Columbia Memorial Health, where he was later pronounced dead.

Doctors determined that an unspecified medical emergency may have occurred before the crash that caused Healy’s death.

The driver of the tow truck, 26-year-old Kacey Gilchrist, of Ellington, Connecticut, refused medical attention and did not report any injuries, police said.

Route 66 between Fish and Game Road and Stottsville Road was closed for a time to remove telecommunications wires in the road. The road reopened just after 4:30 p.m.