A sickness beneficiary who suffered a rare shaking syndrome was last seen standing vacantly in the middle of a Christchurch bridge on the night he drowned.
A coroner has found Craig Trevor Beckley, 47, died accidentally after he fell into the city's Heathcote River some time after 10pm on October 30 last year.
Several witnesses who saw Mr Beckley that night said he was acting in a drunken manner, but Coroner Richard McElrea has found there was no evidence he had been drunk.
He found Mr Beckley's apparent intoxication was likely due to myoclonus dystonia - a rare condition which causes involuntary shaking of the limbs.
Mr Beckley, a sickness beneficiary who lived alone, had left the Embankment Tavern on Ferry Rd on his bicycle about 5.30pm.