A vacation to paradise has turned into a nightmare trip for one Kansas family after a three-hour snorkeling tour ended in bloodshed and a young man's arrest. Avery Nissen stands accused of repeatedly stabbing the captain of a catamaran during the snorkeling trip to Honokōhau Harbor, located off the Kona coast, according to Hawai'i Island police. The department said in a statement that Nissen, 21, allegedly stabbed Stan Lurbiecki on Thursday, April 16, with a knife typically used for fileting fish. The stabbing incident allegedly occurred just after 3 p.m.