David Oldham, 55, was found dead outside his home in Columbia, New Hampshire, on July 1, 2015. An autopsy determined he died of a gunshot wound to the head and his death was ruled a homicide.

Detectives processed the scene and pursued tips over the years, but no suspects have been publicly named and no arrests were announced. The New Hampshire Cold Case Unit has reexamined physical evidence with newer forensic technology and the family has made public pleas and offered a reward as they continue to seek answers.

What details do readers from Columbia or northern New Hampshire remember from the area around July 2015 that might help investigators?