The movie star turned politician who forged a conservative revolution that transformed American politics, died on Saturday at the age of 93.
His wife, Nancy, and family members had gathered at his bedside at his house in the Bel Air district of Los Angeles.
All US TV networks broke into programming to announce Reagan's death just after 16:45 (20:45 GMT) on Saturday.
Reagan has suffered from the brain-wasting Alzheimer's disease since 1994 and his condition is believed to have worsened in the past week.
Reagan was US president from 1981 to 1989.