In recent years, the Louisville area has experienced a rise in overdose deaths involving heroin. Between 2014 and 2017, heroin-related overdose deaths in Jefferson County increased by 28.57%, growing from 105 cases in 2014 to 135 cases in 2017. Meanwhile, the total number of overdose deaths in the county swelled by 108.82% during the same time frame. Interestingly, the percentage of overdose deaths involving heroin fell 38.43% between 2014 and 2017 despite a rise in the raw number of heroin-related deaths in the same time period. This disparity may be attributed to a coinciding rise in overdose deaths in Jefferson County involving another deadly opioid, fentanyl.