"What happened: Lim Kimya, a 74-year-old former Cambodian opposition lawmaker, was shot dead yesterday near Bangkok's Khaosan Road just hours after arriving from Cambodia. Thai police have issued an arrest warrant for a 41-year-old motorcycle taxi driver suspected of being a hired hitman. Why it matters: The assassination highlights growing dangers for Southeast Asian dissidents as regional governments increase cooperation against political opponents. The killing occurred the same day Cambodia's Senate head called for new anti-terrorism laws targeting government critics."