Imtiaz Khan is the relative who urged authorities to take another look at Urooj Khan's death.
Khan died in July 2012 before he had a chance to cash a $425,000 lottery check.
Medical examiners initially ruled that he died of natural causes but his brother raised suspicions.
"When I went to pick up the body, I told the medical examiner, 'Sir I don't think he died of natural causes, no, I don't think. Please do more test on him,'" Imtiaz Khan said to ABC7 News.
Urooj Khan's body was exhumed after examiners found cyanide in a blood sample and reclassified his death as a homicide.