PHOTO: SUPPLIED – Donna Manning died in the CTV building.

Families are disappointed an intense, three-year investigation into the Canterbury Television (CTV) building collapse has ended with a decision not to press charges.

Details of the decision emerged on Thursday when the Ministry of Business, Innovation and Employment (MBIE) told families in an email the prosecution would not got ahead.

The CTV building in Madras St, Christchurch, collapsed during the magnitude-6.3 earthquake on February 22, 2011, with the loss of 115 lives. Many others were seriously injured.