Obituaries:

The Atlantic: Alan Rickman’s Extraordinary Legacy. “Through more than four decades of work on stage and screen, the English star was a definitive actor for generations of audiences.”

BBC: Obituary: Alan Rickman. “British actor Alan Rickman, whose career ranged from Britain’s Royal Shakespeare Company to the Harry Potter films, has died. He was 69.”

BBC: Alan Rickman: A life in pictures. “Actor Alan Rickman, known for films including Harry Potter, Die Hard, Truly Madly Deeply and Robin Hood: Prince of Thieves, has died at the age of 69. A family statement said: “He was surrounded by family and friends.” Here, we present pictures of him in some of his best known roles.”

New York Times: Alan Rickman, Actor Known for ‘Harry Potter’ and ‘Die Hard,’ Dies at 69. “Alan Rickman, the accomplished British stage actor who brought an erudite dignity to film roles like Hans Gruber, the nefarious mastermind of “Die Hard,“ and Severus Snape, the dour master of potions in the “Harry Potter“ series, died on Thursday in London. He was 69. A family statement published by the BBC said the cause was cancer.”

The Guardian: Alan Rickman, giant of British screen and stage, dies at 69. “Much-loved star of stage, TV and films including Harry Potter and Die Hard – and owner of one of the most singular voices in acting ­– has died in London.”

The Washington Post: Alan Rickman, actor who brought dynamic menace to ‘Die Hard’ and ‘Harry Potter,’ dies at 69. “Alan Rickman, the classically trained English actor who excelled as tormented fiends and aristocratic weasels in films such as “Die Hard“ and the “Harry Potter“ franchise, and who also used his languid manner to surprising effect in romantic comedy, died Jan. 14 in London. He was 69.”

The Washington Post: Daniel Radcliffe’s touching tribute to Alan Rickman: ‘He was so encouraging of me’. “Daniel Radcliffe grew up as the star of the “Harry Potter“ films, living out the first years of his career surrounded by some of the most established names in British acting. One of those actors: Alan Rickman, whose death at the age of 69 was confirmed by his family on Thursday.”

Die Zeit: Die Stimme von Witz und Noblesse. “Zwielichtige Gestalten prägten Alan Rickmans Weg zum weltbekannten Schauspieler. Doch er konnte weit mehr. Sein Tod ist ein großer Verlust für Kino und Theaterbühne.”

MetaFilter: Alan Rickman 1946 – 2016 obituary thread.
As usual there are a lot of links to articles and film clips in there, as well as some personal anecdotes.