LOVELAND, Colo. — Police in northern Colorado are investigating any possible link between the slaying of a man on a neighborhood sidewalk and two previous shootings of a bicyclist and a driver.

Police and the FBI refused to comment Thursday on the possibility of a serial shooter. But they have offered a $10,000 reward for information on the first two unsolved shootings that authorities say are related — though they haven’t said how.

In the latest case, 65-year-old William Connole was found on a sidewalk along a main street in Loveland. Family and neighbors say Connole had survived cancer and often took late-night walks through his quiet neighborhood.

The bicyclist, 48-year-old John Jacoby, was found dead May 18 along a rural road in Windsor. On April 22, Cori Romero, 21, was driving on Interstate 25 when she was shot in the neck. She survived. All three shootings occurred within 15 miles of each other.

“We don’t have any specific information from the shooting that occurred here last night that this case is related,” Loveland Police Chief Luke Hecker said Thursday. But he noted there were enough similarities to investigate a possible link.

Shootings are rare in Loveland, a city of about 70,000 people about 50 miles north of Denver.

Sadie Rogers, 15, said Connole was her grandfather and had worked for years in the computer industry before taking a job at Home Depot. She said the nighttime walks helped him sleep after work.