A 21-year-old man leapt to his death in front of his girlfriend, 22, in Tuen Mun yesterday during an argument. Yu On-wei jumped from the 14th-floor staircase of Oi Chi House, Yau Oi Estate. In Shau Kei Wan, a 30-year-old woman apparently suffering from post-natal depression plunged to her death from her 35th-floor flat in Hing Fung House, Hing Tung Estate, two weeks after giving birth. Meanwhile, a 43-year-old man facing theft charges is in a serious condition after jumping into the sea from Tsing Yi South Bridge in Kwai Ching Road. The man, from Macau, was picked up by a Marine Police launch.