CCTV of Ezedi on Chelsea Bridge released by police
The CCTV shows Abdul Shokoor Ezedi on 31 January at 23:25 GMT. Police now believe he is dead after going into the River Thames.
The 35-year-old has not been seen since the night of the attack on 31 January, when a corrosive substance was thrown over a mother and her two children.
At a press conference on Friday, Cmdr Jon Savell said their working hypothesis was that he had gone into the water after last being seen at Chelsea Bridge.
In the video, he can be seen in a black jacket with a hood, crossing the road and walking on the pavement.