A Jackson County Sheriff’s Office dispatcher received an unusual call Monday.

A Jackson County Sheriff’s Office dispatcher received an unusual call Monday.

“Sheriff’s Department?” the caller asked, according to court documents. “I just killed a man.”

The call set off a series of events that led to Jackson County prosecutors Tuesday charging 40-year-old Jeffrey S. Sterling, who sheriff’s deputies identified as the caller, with one count each of first-degree murder and armed criminal action. Prosecutors are alleging Sterling gunned down Jerry Thompson Monday at his home at 33901 Colbern Road in Eastern Jackson County.

After Sterling told the dispatcher he shot Thompson, he said he was “at the lake... boat ramp,” according to court records.

Sheriff’s deputies used cell phone tower signals to locate the call. They quickly responded to the north boat ramp at Lake Jacomo.

They located a red 1992 Ford F-150 with a camper shell that was parked on the grass overlooking the lake. A sergeant ordered Sterling from the vehicle. He refused, rolling up his window to avoid contact with the sergeant.

Authorities negotiated with Sterling for two hours before he surrendered without incident, according to court records.

A motive hasn’t been established. But the preliminary investigation found that Thompson and Sterling had a prior business relationship. Sterling told the sheriff’s dispatcher that he had experienced problems and attempted to collect $1,100 for 1 1/2 months, court records show.

“Jerry (Thompson) was the last straw,” Sterling told the dispatcher, according to the records.

A witness at the scene told authorities he saw Sterling, who he referred to as “Jeff the sheet rocker,” according to records. The witness saw a handgun in Sterling’s hand and pointed toward Thompson, the records said.

Authorities recovered a Springfield Amory .45 caliber automatic handgun from inside the truck.

Sterling is being held on $750,000 bond. A preliminary hearing is scheduled for Dec. 15.