FAIRLAND — The wife and grandson of a rural Ottawa County man who was shot to death were tied up during a Tuesday morning home invasion, authorities said. The gunmen were still at large.

The victim was identified as Sam Sanders, 64. Authorities said he died from a gunshot wound to the chest.

The Ottawa County sheriff’s office was called about 4:30 a.m. to the house about three miles east of Fairland.

The two gunmen forced Sam and Lillian Sanders and their two grandchildren to the floor during the home invasion, authorities said. Investigators said a struggle ensued and Sam Sanders was fatally shot. Lillian Sanders, 64, and her 20-year-old grandson were bound. It was not clear if the granddaughter was bound. The girl is believed to be in her teens, said Jessica Brown, Oklahoma State Bureau of Investigation spokeswoman.

The OSBI did not say what type of gear the intruders used to bind Lillian Sanders and her grandson.

A neighbor, Mary Ann Cunningham, said the Sanderses were high school sweethearts.

"If you knew him, you liked him,” Cunningham said of Sam Sanders, a trucking broker.

Brown said the best description of the gunmen was that one was large, the other was small and they were probably white.

It was at least the second home invasion in Ottawa County in less than a week. On Thursday, two men entered a rural residence and held a woman and her grandchildren hostage during a robbery, said Terry Durborow, Ottawa County sheriff. The sheriff’s office said the incidents are unrelated.