A 47-year-old sport fisherman died in Hawaii on Friday after being impaled by a swordfish he had shot with a speargun, CNN reports.

According to Hawaii News Now, charter boat captain Randy Llanes was in Honokohau Harbor on the Island of Hawaii when he spotted the six-foot-long fish and jumped in the water with a speargun.

After Llanes successfully shot the swordfish, however, police say “the fish got wrapped around a mooring anchor, came back and swam at him.” From the Department of Land and Natural Resources:

The fish then reportedly struck the man in the chest with its sharp bill. He was pulled by onlookers from the harbor and was unresponsive.

Responding emergency personnel administered CPR and then took Llanes to Kona Community Hospital, where he was pronounced dead.

“This is very, very unusual.” Waikiki Aquarium Director Andrew Rossiter told KHON-TV. “There have been a couple of cases documented in the past, but almost always it can be attributed to an unfortunate accident or the fish being injured.

[Image via KHON-TV]