Colorado Town on Edge as Authorities Consider Serial Shooter Angle

— -- The FBI has joined a probe into whether a possible serial shooter is on the loose in rural Colorado after a man was fatally shot while biking on a stretch of road recently.

John Jacoby, 48, was found dead near his bike Monday in Windsor, Colorado. Local authorities, who have since called in agents with the Federal Bureau of Investigation, said it is the first homicide in Windsor in eight years. Residents said Jacoby, reportedly a part-time parks worker and grocery store bagger who walked or rode his bike everywhere, was known by many people and loved by all.

"He was just a really positive person you always wanted to seek out," Fire Chief Herb Brady told The Associated Press. "In retrospect, that was a good part of why he was here: to keep people positive."

"John was a real nice guy, gregarious," said Mayor John Vasquez. "When something like this happens, it does shake people."

A memorial was erected where his body was found. Investigators say they are now looking into whether Jacoby's slaying is linked to a mysterious shooting on a nearby highway in April.

On April 22, Cori Romero, 20, was shot in the neck while driving along Interstate 25 near Fort Collins, Colorado. Romero said initially she didn't think she'd been shot. She thought that her window had been shattered by an unknown object and that glass had punctured her skin.

"You don't really think that something like that would happen to you, just driving home from work," Romero said.

Investigators are now concerned that the two cases could be linked. In recent weeks, several other cars, including a sheriff's jail van, also have had windows blown out. It wasn't clear whether gunfire was the cause. The news has residents on edge, though.

"I think obviously people are going to be concerned when they hear of something like this, especially with two incidents within a relatively close proximity to each other," said David Moore, a spokesman for the Larimer County sheriff.

The Pelican Fest Triathlon that was originally scheduled for the weekend in Windsor has been canceled. The organizer posted on Facebook that it was not comfortable with the potential risk. Meanwhile, there are heightened patrols on the interstate and investigators are hoping for a break.

"It would be extremely helpful if we could get a citizen to come forward," Moore said.

Police say they have no suspects.

The Associated Press and ABC News' Clayton Sandell and Tom Llamas contributed to this story.