Examine the relevant case files
James Thurston is the resident manager at the apartments

James Thurston interview
Lester Waterson is the maintenance man at the apartments

Lester Waterson interview
Cheryl Kline lives downstairs from the Fines

Cheryl Kline interview

Investigation Day 4 — Yoknapatawpha County Sheriff's investigators canvassed the Oxford Ridge apartments where Andy & Cindy Fine live.

They spoke to neighbors and employees at the complex.