From the New York Times in the USA:
Ornette Coleman, Jazz Innovator, Dies at 85
By BEN RATLIFF
JUNE 11, 2015
The cause was cardiac arrest, a representative of the family said.
Mr. Coleman widened the options in jazz and helped change its course. Partly through his example in the late 1950s and early ’60s, jazz became less beholden to the rules of harmony and rhythm, and gained more distance from the American songbook repertoire. His own music, then and later, became a new form of highly informed folk song: deceptively simple melodies for small groups with an intuitive, collective language, and a strategy for playing without preconceived chord sequences.
Though his early work— a kind of personal answer to his fellow alto saxophonist and innovator Charlie Parker— lay right within jazz — and generated a handful of standards among jazz musicians of the last half-century — he later challenged assumptions about jazz from top to bottom, bringing in his own ideas about instrumentation, process and technical expertise.
See also here.