A man, who suspected his wife of adultery, killed her and their three children and later committed suicide in Uttar Pradesh's Ghaziabad district, police said on Friday. The incident occurred on Thursday night, they added. Parents of the couple informed Masuri police station after they did not wake up despite repeated knocking on their room door, which was bolted from inside, said Senior Superintendent of Police (SSP) Ghaziabad Sudhir Kumar.