The 17-year-old Muhammad Hassam Ali died from his injuries after he was stabbed in Victoria Square, Birmingham on 20 January.
He was rushed to hospital and later died.
Detectives said the attack was not thought to be gang-related and was believed to be a case of mistaken identity.
Officers said their investigation is ongoing and they continue to analyse CCTV and examine forensic opportunities.
The family are being supported by officers and have requested their privacy be respected at this time.
Police are reviewing CCTV and carrying out further enquiries to establish who was responsible for Muhammad’s death, which is not being treated as gang-related.
Detective Inspector Michelle Thurgood, from our
“We are still trying to establish the motive and are keen to speak to anyone who was in the area just before 3.30pm yesterday.
“We are especially looking for any photos or video footage from the surrounding area which may help us identify those responsible.
“If you were walking through the area at the time, or a visitor who may have been taking pictures by The River statue near the Council House, we would like to hear from you as you may have vital information or evidence.”
Anyone with information that could help the investigation is asked to contact the police via Live Chat on the website, or by calling 101, and quote log 2619 of 20/1/24.