A 22-year-old man was arrested for allegedly stabbing his colleague to death in Haryana's Gurugram due to a long-standing grudge, police said. The accused, identified as Arjun Shavtal, worked as housekeeping staff along with 26-year-old victim, Dalip Kumar, at Hello Guest House. Shavtal revealed that Kumar constantly criticised him for quality of his work and had threatened and beaten him.