sentences:  Derek dies of a heart attack on Christmas Day, leaving Alice and Joey grief-stricken.Lauren develops alcoholism as a result of Max and Tanya's turbulent relationship, which becomes more severe when her parents separate as Max's secret wife Kirsty (Kierston Wareing) reveals herself and moves to Walford.She eventually suffers kidney failure and leaves Walford with Tanya and Oscar to receive treatment and counselling for her addiction in Exeter, but returns several months later alone.