The Coast Guard said five people were aboard the helicopter Thursday. Coast Guard Petty Officer Melissa McKenzie says it was civilian helicopter, "possibly a news chopper."
McKenzie says all five people were transferred to land after the hard landing, which occurred near the Arizona Memorial, a popular tourist destination in Oahu.
A Honolulu Emergency Services Department spokeswoman confirms one victim was in critical condition.
The Coast Guard received notification of the accident at 10:25 a.m.