Police say Tiffany Treanor-Johnson, 27, was involved in a crash in which an Audi struck musician Harry Webb, 27. Reporting across outlets states that the collision occurred in a 20 mph zone while the Audi was travelling at about 53 mph. Sources also say Treanor-Johnson was using nitrous oxide, described in coverage as a Class C drug. After the impact, she allegedly drove away from the scene. Webb sustained serious injuries and later died two days after the crash, with his death attributed to complications from the collision. The case is presented as a fatal road incident involving alleged excessive speed, use of nitrous oxide, and failure to remain at the scene. The reporting also notes that Webb had been speaking with his father on the phone at the time of the crash, according to the accounts described by the sources. Authorities have not been described in the provided material as contesting these elements, but the information reflects what is attributed to reporting and/or investigation as summarized by the outlets.