David Johnson, owner of 2008 Grand National winner Comply or Die, has died of cancer aged 67.
A champion owner over jumps on six occasions, Johnson was mainly associated with trainer Martin Pipe and his son David.
"It is very sad news," said David Pipe. "He was more than an owner - he was a great friend to dad and myself."
Timmy Murphy, who guided Comply or Die to victory at Aintree, wrote on Twitter: "Today I've lost one of the most important people in my life - my friend, my boss David Johnson. Rest in peace x."
Johnson had been suffering with cancer for several years.