New Delhi, March 28 -- A 27-year-old chemical engineer allegedly stabbed a 22-year-old inmate to death on Thursday night at a drug de-addiction centre in Hiranki near Alipur in north Delhi, police said. The accused, Arun Joshi, was arrested from the spot and a blood-stained knife was recovered, police added. Both were admitted to the centre for drug addiction treatment. htc...