A groom and his three nieces have died after a helicopter crashed just hours before his wedding.

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A groom and his three nieces have died after a private helicopter crashed and plunged down a canyon just hours before his wedding in the US.

David McCarty, 59, was flying family members in his MD 369FF helicopter through Telegraph Canyon near Superior, Arizona.

Mr McCarty died alongside his nieces Rachel, 23, Faith, 21, and their cousin Katelyn Heideman, 22, The Sun reports.

At 11am the helicopter collided with a “recreational slackline” strung across the mountains, sending the aircraft plummeting to the canyon floor.

Emergency crews were forced to hike to the crash site, reaching the mangled wreckage around 5pm.

Police say, all four victims were pronounced dead later that evening.

Pilot and groom David McCarty, 59, was among four members killed in a horror helicopter crash on his wedding day. Picture: Facebook
“He just wanted to show his family around,” a relative said.

The group had travelled from Oregon for what was intended to be a celebratory family weekend.

The crash occurred just hours before Mr McCarty’s wedding.