Max Key also acknowledged Bennett's passing, sharing a number of photos of the pair together, as well as one with former Prime Minister Sir John Key.
"Some absolutely shattering news today,'' Max Key wrote.
"You taught me how important it is to not take yourself too seriously and to live life to the fullest! Was so epic causing mischief with you and I hope you swig hard up there. RIP my friend.''
"Associates assisted initially and then emergency services including ambulance, fire and police attempted to revive the male but were unsuccessful."
Henshaw said the matter had been referred to the coroner.
Bennett has a huge online following, with more than 200,000 followers on social media site Instagram.
Johnny Bennett, aka Johnny Danger, with his Harley Davidson in April. Photo / Facebook
Footage posted by Bennett last night showed photos and video of his motorbike, acknowledging he was preparing for a ride today.
Video posted online today showed him getting ready to take part in an Anzac Day motorbike ride with several others.
In one clip, the group is outside a petrol station on Quay St, in downtown Auckland, getting ready to head off.
Bennett can be seen picking up his helmet and fastening it before hopping on to his bike.
Last November, Bennett posted a photo of his new motorcycle licence; clearly excited to get it.
He told fans: "My new licence photo, finally got my full bike licence! I didn't know I was getting a new pic so I had no time to think up something, this will do for now. Time to get a Harley now.''
Bennett, of Whangaparaoa, has a huge following of fans on social media sites.
He has up to 204,000 followers on his Instagram page and a quarter of a million on Facebook - and numerous tributes have been posted on both sites already.
Police attend the scene of a fatal motorcycle accident on the Dairy Flat Highway. Photo / Dean Purcell
The amateur stuntman and comedian is hugely popular with Kiwis and also has an international following; with his videos attracting comments from fans from all around the world.
In 2015, he was found guilty of causing a criminal nuisance after video footage surfaced of him "surfing'' on a taxi as it went over the Auckland Harbour Bridge in 2013.
The taxi-surfing video - which went viral on social media and featured on international news sites - shows a man climbing out of the vehicle's passenger-side window and precariously clinging to the Reliable Cabs sign on the roof.
Bennett's beer brand "Dangers Beer" was pulled from the shelves of a major New Zealand supermarket chain, following a backlash online.
Waitakere crash
Meanwhile, police confirmed there had been another fatal motorcycle accident on Mcentee Rd in Waitakere.
The rider, a man in his 60s, died at the scene, police said.
St John said two ambulance vehicles attended the crash at 3.16pm.
A second motorcycle crash occurred on Mcentee Rd in Waitakere. Photo / Google
A resident on Mcentee Rd said she had had to take a longer route home this afternoon because of the diversions in place.
She did not know anything about the crash, but said: "There are lots of lights and sirens at the moment''.