State wildlife officials say the otter that attacked a boy and his grandmother as they were swimming in the Pilchuck River has been captured and killed.

Capt. Alan Myers of the Washington Department of Fish and Wildlife said Monday the male otter was shot by federal officials near the place where the attack took place at the end of July, about 30 miles northeast of Seattle.

Myers says they are nearly certain they have got the right otter because of its unusually aggressive behavior. Otters are more likely to avoid people than to attack them.

The otter shot on Sunday afternoon was at least four feet long. A necropsy is being conducted to find out if some disease or injury may have contributed to his aggressive behavior.