Hi °C | Lo °C 
Dennis Hopper's works of art, memorabilia and decorative arts are going on the auction block in New York.
Among the highlights is a portrait by Andy Warhol titled Mao. The auction house says the late Easy Rider star shot two bullet holes into the portrait of the Chinese communist leader Mao Tse-Tung after a wild night in the early 1970s.
Christie's says Warhol circled the holes and labelled them "warning shot" and "bullet hole". It says the two men agreed to call the work a collaboration.
The screenprint has a pre-sale estimate of 20,000 to 30,000 dollars. (£13,000-£19,000)
The January 11-12 sale also has posters from the film star's movies, including Apocalypse Now and Blue Velvet. Most are estimated to sell for 200 to 500 dollars (£130-£320).
