Police in Knox are conducting their own death investigation after a 23-year-old was found in cardiac arrest earlier this week. Knox police were called out Thursday to a home on South Main St. were they found 23-year-old Nicholas Harmon in cardiac arrest, that's according to WKVI. Harmon was transported to IU Health Starke and then airlifted to Memorial Hospital in South Bend where he later died. Officers continue to investigate whether or not alcohol or drugs played a factor in Harmon’s death. Police do have a person of interest detained.